Vacuum Tube Power Supply Kit

(This is a seven pin vacuum tube. 5 V Standby. Welcome to Tube Audio Supply !! We carry vintage amp parts and supplies: chassis, tube sockets, electrolytic caps, coupling caps, resistors, turret boards, Switchcraft jacks, potentiometers, knobs, pilot lights, #47 lamps, new, used and NOS tubes in the most popular types used in guitar amps today. You need to add tubes (any kind) and an external power supply (7. Play next; Play now; ARGON rectifier tube - vacuum tube radio / electronic Power Supply kit model One tube radio kit - LOW VOLTAGE design - vacuum tube. Each of the power supply components including the line filter, transformer, rectifiers, choke (if utilized), and certainly the smoothing capacitors and regulators (if utilized) all have a role in the sound of the power supply. See Figure 2. Power rails of vacuum tube amplifiers are 400v+. The Ameritron advantage: Extra heavy duty power supply gives you peak performance year after year The heart of the AL-811 power supply is its heavy duty power transformer with high silicon steel core weighing a hefty 17 pounds. Designed by Kevin O'Connor of London Power. We carry premium hand selected vacuum tubes for guitar and HiFi amps. The Rectifier and Filter - The 6X5 tube is widely used as a rectifier in vibrator supplies with the 6Z4 and 84 types also used. 1x RFT AG1006 - Half-Wave Vacuum Tube Rectifier Power-Supply = 3102_OSW OSW3102 See more like this SPONSORED High voltage power supply module kit DIY for Nixie tubes. Output Vacuum Tubes; Preamp Vacuum Tubes; Rectifier/Power Supply Vacuum Tubes; Amp Tools & Supplies; Mojotone FX Loop; Kits. Description. This Kit builds the circuit to trigger a high voltage xenon flash-tube using a 12V DC input from a power supply. zero feedback by Bartolomeo Aloia - old project rear and front photo (click on image to enlarge) High Level Section; High Level List. The new power supply really wakes up the sound, adds life and punch to the music.



That cuts both the primary power supply and the heater power, so it all simply stops and cools off. So, I published a Power Supply design for tube experiments – with redundant safety and small size in mind, am providing a kit of said design, and published a free 6SJ7 preamp which you CAN BREADBOARD with the above supply. Manufactured in May, 1963. It poses no fire hazard, since its intended to be powered from a 12VDC wallcube, and nominally draws less than 200mA (less than 2. You are eligible for a full refund if no ShippingPass-eligible orders have been placed. and on Ebay. Watts Tube Audio | DIY guitar amp parts & kits. Direct heated triode power output tubes are really interesting. Whether you are replacing the tubes in your guitar/bass amp; updating your home audio system: re-tubing your microphone or changing out the organ tubes, we have what you need right here. Blackface Amp Kits; British Amp Kits; Brownface Amp Kits; Mojotone Amp Kits; Tweed Amp Kits; Capacitor Kits. Psvane Acme series have 845, 300b, 802, 211, 2a3, 274b and 212 tubes. 3-500ZG-RFP Transmitter Tube, RF Parts (2 Year Warranty) Anderson Power Pole. Power Transformers; Output Transformers; Filter Chokes; Reverb Drivers and Interstage Transformers; Vacuum Tubes. The output of this small amplifier in which a 6V6GT output pentode is connected as triode is about 4. Therefore, the QSK kit is only available as a set of PC boards or as a partial kit with all components EXCEPT the vacuum relays. Will this add much weight to my blower?. Hickok 5720 FET Multi-Meter 28.



The Ameritron advantage: Extra heavy duty power supply gives you peak performance year after year The heart of the AL-811 power supply is its heavy duty power transformer with high silicon steel core weighing a hefty 17 pounds. I typed out this short but hopefully sweet primer on compensation and negative feedback. The receiver lights up and some stations are heard but it is staticy. Vacuum Tubes Retailers New and NOS Tubes Audio Electronic Supply : Tube Amplifier Kits and parts Vintage Hifi Rebuild Kits, Capacitors Vacuum Tubes (Electron. Vacuum Tube prototype / project kit for 8 pin tubes. That cuts both the main power supply and the heater power, so it all simply stops and cools off. Guitar Amp Kits Directory. Ideally, we would power the volume oscillator from this regulated supply as well, but it draws a bit more current than the regulator tube could comfortably handle. 3Vac heater winding, and a 5Vac secondary for the tube rectifier. ***NEW PRODUCT – PM-HP24 Power Supply Rebuild Kit for the Heathkit HP-24 Power Supply*** 05 November 2016: Harbach Electronics. I've Never Lost the Wonder. PS-10: All-in-One Tube Power Supply The PS-10 is a new All-in-One power-supply kit for tube lovers. Welcome to Vacuum State. See Figure 2. tubes,radio,vacuum,ham radio is a curation of 17 resources about , Econco, Greenstone USA, Eimac, Greenstone USA, Engineered Composites Ltd. Detailed, complete with plenty of math and drawings.



Phono Preamps. In simple code circuits, such as the Pastime Projects “Remember When” reproduction “breadboard” transmitter kit, or the new 6V6 MC kit, the tube can be thought of as a switching amplifier/oscillator. To turn it off, don't mess with the standby, just turn the power switch off. Also, wattages can be changed without losing the tone of the power amp. Potentiometers. info Vacuum tube design and app notes The Valve Wizard guitar amp theory. Before You Start. As you can see, despite 44+ years age at the moment of purchase, there are very few noticeable signs of wear. Featuring 60 watts or more per channel of tube power, the amp's ability to run in either triode or ultra-linear mode offers more versatility than most any other. DACT volume control, it provides very smooth switching action. 00฿ Pre Amp Kit - 6C11 Tube car. ) The circuit above uses two 120 to 12. Exclusive collection of Vacuum Cleaning Cleaner Brush, listed for sale at discount prices. Engine Vacuum Hose Kit - L-82 L-48 NB2 NA6 Engine hose vacuum kit, w/L-82 & L-48 NB2 or NA6. One 1/2 inch driver One 0. For acoustic guitar repair, thoroughly clean the parts before applying glue. Click on your selection below: ST-35; ST-70; MARK.



(Don't let a tube checker be the last word with respect to the quality of your tubes. Our tube cleaning supplies deliver the highest performance and deliver the result you need for critical tube cleaning and maintenance operations. 0 g 104623 1. I'd appreciate feedback. brand NEW ST70 amplifiers, VTA ST-70 amp kits are in stock and ready to ship ST70 amplifier features: 1. 97 each ***** VINTAGE 7-PIN TUBE SOCKETS!! High quality vintage N. Some Refurbished / Restored & tested w/ 90 day warranty. Elekit (EK Japan Co. a 4 tube line stage only preamp, includes tube power supply, NOTE: the SP12 is the ONLY preamp kit we have with the OPTION of adding an internal phono stage to create an "all-in-one" preamp. 3Vdc heater power source. Welcome to Tube Audio Supply !! We carry vintage amp parts and supplies: chassis, tube sockets, electrolytic caps, coupling caps, resistors, turret boards, Switchcraft jacks, potentiometers, knobs, pilot lights, #47 lamps, new, used and NOS tubes in the most popular types used in guitar amps today. Vacuum Tube Supplies, LLC. One caution is,,,, A silk on board says "12V centre +" but adding 12V will break 3. Such as tubes,tubes sockets,switches,capacitors,resistors,PCB,chassis to get you started,ampmart. This power source supplies the energy for the RF output power. BGMicro Electronics - Home > Power Supplies / Equipment > Artesyn Medical Grade Single and Triple Output Power Supply +5 +12 -12 Previous in Power Supplies / Equipment Next in Power Supplies / Equipment >>. Tighten the set screw using 3/32” Allen wrench to secure sensor cap. What It's Worth: Vacuum tubes worth more than the tube tester. Hickok 5720 FET Multi-Meter 28. Reattach the sensor cap to the flushometer valve body while ensuring wire supply tube is properly inserted into thru-hole in wall.



The Main Power Supply produces the required voltages for the 4-400A. It is designed to address audiophile's complaint that '300B amps are not powerful enough to drive those non-high efficiency speakers, but I still want the 300B sound'. com MDB Ventures Radio Electric Supply Large Selection of Antique Radio Tubes Sophia Electric The Tube Center NOS vacuum tubes Tube Depot TubeMan. Psvane Acme Series 2a3 Vacuum Tube Matched Pair All New. EL84 - JJ Electronics - The JJ EL84 is an output pentode for use in guitar and Hi-Fi amplifiers. A Tube-Based Bench Supply for Tube Projects Power those classic tube projects with this adjustable regulated supply. The grid will be at 1 V below the cathode so it will be running at 136V. This is my first successful vacuum tube project. The hot tube filaments let the tubes continue sucking current out of the power supply filter caps so the caps are mostly drained of dangerous voltages. Our commitment to providing the best products to meet our customers' needs is second to none. Each of the power supply components including the line filter, transformer, rectifiers, choke (if utilized), and certainly the smoothing capacitors and regulators (if utilized) all have a role in the sound of the power supply. Vacuum tube biasing methods. Vacuum Bagging Films & Tubes - Breather - Release Films - Peel Ply - Sealant Tape - Vacuum Infusion Supplies. 95: Marshall JCM800 2204a 50w Tube DIY Amp Kit VERSION 1 $474. 3V filament winding could even be shared between the PS board and a tube. Remember those old TVs with boat anchor type power transformers? (Of course, if you recall those, you also recall the fond days of vacuum tube sets and the corner drugstore with a public tube tester!). DC-AC Power Inverters Kits & Supplies (29) Floor Mats, Markings & Accessories How about your own vacuum tube headphone amp,.



Increasing the capacitance of a power supply filter cap lets it store more electrons. 3-500ZG-RFP Transmitter Tube, RF Parts (2 Year Warranty) Anderson Power Pole. 470uF Electro's are often used in high quality valve amps today. After receiving the kit i did a parts check list and found Transistor MPS-W42 was substituted with a ZTX 457 transistor. If you cannot prepare high-quality 9V power supply, please use 006P (9V) battery as power supply. Elekit (EK Japan Co. Also Buys New Ceramic Tubes And Rebuildable Ceramic Tube Duds. To handle the apparent power factor (APF) of heavy charging currents at the leading edge of each sine wave voltage peak, capacitor input supplies should use a little larger copper winding size. For acoustic guitar repair, thoroughly clean the parts before applying glue. The builder should be familiar with working around high voltage before applying power to this kit. No blooming. The mps-W42 is a one watt high voltage transistor but the ZTX457 is a medium power high power, this transistor will probably work but it should be annotate on the parts list or the schematic. Hallicrafters S-12 Receiver 19. Tube measurements are as follows: Height: 2. The kit for this one is mono, and the fully enclosed Rack Case is designed to accommodate two amplifiers. and on Ebay. 5 about 10 years ago. BGMicro Electronics - Home > Power Supplies / Equipment > Variable Voltage Power Supplies Kit Previous in Power Supplies / Equipment Next in Power Supplies / Equipment >>. 1x RFT AG1006 - Half-Wave Vacuum Tube Rectifier Power-Supply = 3102_OSW OSW3102 See more like this SPONSORED High voltage power supply module kit DIY for Nixie tubes.



Conar was an expansion of the National Radio Institute's student supply division that functioned primarily to supply test equipment to NRI students and graduates. Detailed, complete with plenty of math and drawings. The only noticeable problem was a power supply filter capacitor with small but visible level of leak. The result is a two channel tube mic pre — featuring Jensen input/output transformers (optional), phantom power, input pads, and regulated supplies — that can be built for about $400 in materials. The mps-W42 is a one watt high voltage transistor but the ZTX457 is a medium power high power, this transistor will probably work but it should be annotate on the parts list or the schematic. -40 °C to +70 °C Operation. Your Position: Home > Shuguang Tube > Emitter Tube > Shuguang 813A (813) Vacuum Electron Tube 1PCS Prev Next Shuguang 813A (813) Vacuum Electron Tube 1PCS Order Code: AM000352. BORDEN RADIO COMPANY. HF radio power supplies. more details on www. Singled Ended amps doesn’t need regulated PSU because they work in pure class A, so the current is fixed (throught the tube bias) but It need to be really stable to avoid distortion. power vintage AM transmitters — Johnson, Harvey Wells, Heathkit, and the like. Components selection : 12AX7 tube from Telefunken. Headphone Amps. Its a lethal voltage, so make sure you know what you are doing. As the amplifier (tube and plate resistor) "looks back into" the power supply it would like to see a pure DC. Vacuum inside guitar bodies and other tight spaces Converts any vacuum into a powerful micro-vac! Clear the dust from electronics cavities. AM Farm Radio Power Supply (C) 2010, G. Full retrace blanking and fully automatic sync. This is clearly a "novelty" or "nostalgia" kit; it makes no serious attempt to compete with other, more modern transmitters.



For solid-state devices with rather low voltage the realization of a high-quality source does not represent the special problems. AC and DC Power Jacks AC Power Products Adapters Adjustable Power Supplies Air Conditioning Dual Capacitor A ir cylinders Air Pump Alarm System /Contacts Alligator Clips: Amplifier Tubes Android Box Antenna Antique Radio Arduino UNO Audio Adapters Audio Cables. AC OK, Remote On/Off and Active Current Share. Blackface Amp Kits; British Amp Kits; Brownface Amp Kits; Mojotone Amp Kits; Tweed Amp Kits; Capacitor Kits; Guitar Wiring Kits; Pedal Kits; Pickup Kits; Switching Kits; Vacuum Tube Kits; Cabinets. New, unused RCA Marine Transmitter Receivers. Figure 2 shows the circuit diagram. pump diverter valve, EGR valve and fitting, EFE valve and fitting, spark controls, carburetor idle control, A/C vacuum diaphragm and clean air and choke tubes. ***NEW PRODUCT – PM-HP24 Power Supply Rebuild Kit for the Heathkit HP-24 Power Supply*** 05 November 2016: Harbach Electronics. Turn Filters Off! Low Voltage (<50V) Power Amplifiers. Receivers using loctal type tubes may use a 7Y4. Blackface Amp Kits; British Amp Kits; Brownface Amp Kits; Mojotone Amp Kits; Tweed Amp Kits; Capacitor Kits. Most valve amps above 40 Watt are configured in Class AB (Negative bias). Play Things of the Past Vintage Radios, Tubes, Parts. The builder will need a crystal and power supply. To turn it off, don't mess with the standby, just turn the power switch off. If you love vacuum tubes, these pre-amps have your name on them.



Xcelite Tool Kit 21. Exclusive collection of Vacuum Cleaning Cleaner Brush, listed for sale at discount prices. See Figure 2. Electron Tubes & Vacuum Devices. A build and review of the Odd Block KT88 Series 1 Tube Amp Kits. That cuts both the main power supply and the heater power, so it all simply stops and cools off. Power Supply Kit Accessories Kit Volume Control Filter Input Selector Delay Protection Bare PCB Parts & Components Cables Connectors/Sockets Power Switches Selector Switches Rotary Knobs Stereo Stands Solders Tube Convertor Meters Scaffold Connecting Wires Others EH Tubes TUNG-SOL Tubes TJ Full Music Tube Shuguang Tube. Staco Variac AC Power Supply 23. Output Vacuum Tubes; Preamp Vacuum Tubes; Rectifier/Power Supply Vacuum Tubes; Amp Tools & Supplies; Mojotone FX Loop; Kits. Old-style TV sets and other electrical products made between the 1930s and 1970s contain vacuum tubes for creating, amplifying and modifying electrical signals. Mityvac continuously strives to bring innovative products to market that meet customer needs. One caution is,,,, A silk on board says "12V centre +" but adding 12V will break 3. Replace the carbon resistors in the power supply section. conventional tubes beam-power tubes uhf tubes planar tubes cold-cathode tubes - 14178_105 answers to questions q1. Here is a Heathkit FM Vacuum Tube Receiver Model FM-3A. Peebles Originals - fine radio kits and great resource for radio kits, crystal & other radio & radio related projects + hard to find parts. 8 tube subminiature receiver uses 5907 tubes. Hoffman Amplifiers stocks tube amp parts for the DIY tube amp builder, Hoffman Amps ships guitar amp parts all over the world, tube amp for guitar.



The Vacuum Tube Night Light uses a 1960s-era 0A3/VR-75 cold-cathode gas-discharge tube and a rectifying circuit to create a lamp that provides a soft, orange glow. OK, now say all the jokes you want about this article being biased. We carry premium hand selected vacuum tubes for guitar and HiFi amps. DIY Kits, Digital Audio Source Convertor, Phono Stage Amplifier, Preamplifier, Power Amplifier, Headphone Amplifier, Speakers Vacuum Tube Sockets. We Deliver Worldwide To Over 65 Countries. 1) Check that power connections are secure, both main power cord and 6 pin connections from power supply to preamplifier. The classic 5U4G rectifier tube smooths the AC for the power supply. A constant current source (LM317HVT voltage regulator) is used to force the output stage into class-A operation. HEATHKIT FM VACUUM Tube Radio Receiver Model FM-3A - $40. Constant Voltage vs Constant Current Constant voltage (rather than constant current) is the most common vacuum tube heater drive technique. FUN WITH TUBES. Although we are based in the UK, most of our customer base is out of the UK. The output transformer of a tube amplifier acts as the electrical interface between the very. Buy Vacuum Cleaning Cleaner Brush now!. Each of the power supply components including the line filter, transformer, rectifiers, choke (if utilized), and certainly the smoothing capacitors and regulators (if utilized) all have a role in the sound of the power supply. All use 12A_7 tubes. AC OK, Remote On/Off and Active Current Share. Genalex Gold Lion PX300B vacuum tubes (December 2017) GlisDome anti-vibration Teflon-coated disks - for easily moving/decoupling heavy speakers and amps; Guizu BWAV 3B - wood HiFi rack (October 2008) P.



No nomenclature. 6-V windings to drive the amplifier’s tube heaters in parallel. LTD) has been producing electronics kits since the early 1970's. DIY amp parts and kits. This is simple to build audiophile class-A tube headphone amplifier. Vintage Tube Regulated Power Supply 200B Electronics Measurements Company EM Removed from storage, not tested. Elekit (EK Japan Co. The result is a two channel tube mic pre — featuring Jensen input/output transformers (optional), phantom power, input pads, and regulated supplies — that can be built for about $400 in materials. 0 g 104623 1. Play Things of the Past Vintage Radios, Tubes, Parts. Specializing in vintage tube amp replacement parts for Fender, Marshall, Vox and other guitar amplifiers. New JJ 6V6 S Platinum Matched Pair Power Tubes. Peebles Originals - fine radio kits and great resource for radio kits, crystal & other radio & radio related projects + hard to find parts. This is a noncommercial site operated by Max Robinson and dedicated to passing on and preserving knowledge of vacuum tube circuits and techniques. Make your soft robot! Comes with a Programmable-Air board with an Arduino-compatible Nano, power supply, micro USB cord, extra silicone tubing and pneumatic connectors, materials to make handheld vacuum pickup and to make jamming grippers. One 1/2 inch driver One 0. NEW (4-20-09): Henry’s given the internet some additional explanation of choke vs. Kansas City, MO – April 19, 2019 – VacMaster® a Kansas City based manufacturer, will showcase its wide variety of Vacuum Packaging Machines, Food Safe Bags, Immersion Circulators, and Sous Vide Equ…. Psvane Acme Series 2a3 Vacuum Tube Matched Pair All New.



I became fascinated by the signals Richard Beckett, WØBVT, put on the air with his "Pine Board" AM transmitters that run 3 or 4 W using only vacuum tubes. through q18. They are a pure power amp with approx 2V sensitivity and ideal when mated with our L2 or L3 Pre-amplifiers. You don't need to own an Arduino to use this kit! It is self contained and runs without an external Arduino board. Even if you are only working with vacuum tubes that operate at 400 V, an ESD workbench mat makes a lot of sense. 3CX1500A7 / 8877 Kit Solid State direct replacement modules are much more efficient than their vacuum tube. ***NEW PRODUCT – PM-HP24 Power Supply Rebuild Kit for the Heathkit HP-24 Power Supply*** 05 November 2016: Harbach Electronics. Hey All! Please note that we are currently processing credit card payments through cashapp. The Glowbug 40 is a single-tube, crystal-controlled transmitter that, in my experience, pumps out 1. Rugged Industrial Construction. This is a noncommercial site operated by Max Robinson and dedicated to passing on and preserving knowledge of vacuum tube circuits and techniques. A new power supply was designed to give this amp what it really wants, more voltage. single ended tube output circuits - the 125 SE series (Listed Nov. Output Vacuum Tubes; Preamp Vacuum Tubes; Rectifier/Power Supply Vacuum Tubes; Amp Tools & Supplies; Mojotone FX Loop; Kits. While their main focus has always been educational kits, more recently they started to offer hifi audio amplifier kits.



AC and DC Power Jacks AC Power Products Adapters Adjustable Power Supplies Air Conditioning Dual Capacitor A ir cylinders Air Pump Alarm System /Contacts Alligator Clips: Amplifier Tubes Android Box Antenna Antique Radio Arduino UNO Audio Adapters Audio Cables. 3Vac heater winding, and a 5Vac secondary for the tube rectifier. through q18. NO CHANGE IN PRICE AND SAVE A LITTLE ON SHIPPING COSTS!. About True Power Master Sensor Socket Kit - 7 Pieces. The supply for my design consists of a transformer which converts 110V AC to 300V and 6. Tubelab breadboard of the SE845, prototype PowerDrive circuit is mounted to the heat sink behind the tubes. With the most extensive resource of supply parts and components to thermoforming manufacturers, and over 80 years of combined experience in the thermoforming industry, we provide both the experience and expertise to help you meet today’s ever - increasing challenges. Power Supplies. which can be supplied by any of the power supplies found in the EE department laboratories, I had to build my own power supply. In the 1970's German radio modified the original U-47 incorporating this glass style tube to conform to broadcast standards. They claim to have new patents in vacuum tube audio which have been used in these series like composite metal mesh screen pole structure for big power tubes and they are stable and very good sounding. For the Altec 1566, there is no simple answer - just many options - each with it’s own pluses and minuses. This article presents various vacuum tube power supply designs and some solid-state versions. The output of this small amplifier in which a 6V6GT output pentode is connected as triode is about 4.



1x Decoupling base, 4x Spikes. Equipment such as Oscilloscopes, Tube Testers / checkers, Audio AF Signal Sine Wave generators, VTVM’s, Triplett 630-PL and Triplett 310 VOM’s, VTM’s, Transistor Testers, Vari-AC’s, Dummy Loads, Power Supplies and more, by B&K Heathkit RCA Eico, Fluke, Micronta, Simpson, Triplett. Because of our tradition of supplying the highest quality tubes, we are proud that our ouput is the very best in the world for upgrade and replacement. Toroid transformer T30 can provide these AC power supply for this DIY kit 2. [Autuin] mounted one in a wall wart. Headphone output. It is an All-in-One due to it holding everything, including the power transformer Tr-PS-1: Regulated Low-Voltage PS. Guitar Kits Vacuum Tube Circuits Planes Detailed instructions to build a DIY Vacuum Tube / MOSFET Hybrid class. Power rails of vacuum tube amplifiers are 400v+. 5MH choke connected in parallel connected to the grid (pin 5) forms a frequency stable oscillator circuit that is amplified by the 6L6 tube. Power Supply Schematic KT88 Push-Pull Tube Amp. They are a pure power amp with approx 2V sensitivity and ideal when mated with our L2 or L3 Pre-amplifiers. (Note that 117L7 and 117M7 tubes are interchangable. Watts Tube Audio | DIY guitar amp parts & kits. What It's Worth: Vacuum tubes worth more than the tube tester. AM Farm Radio Power Supply (C) 2010, G. This is simple to build audiophile class-A tube headphone amplifier. Central Vacuum Stores is the authority on installing, replacing, and repairing central vacuum systems, including Imperium, Vacu-Maid, Beam, Vacuflo, Nutone, Honeywell, and most others.



They also have an enormous supply of DIY parts and vacuum tube related literature. Resources listed under tubes category belongs to Manufacturers main collection, and get reviewed and rated by amateur radio operators. Keep the electrons flowing and the tubes glowing. Vacuum Tubes. Included are some fantastic DIY vacuum tube amps and headphone amplifiers. Each of the power supply components including the line filter, transformer, rectifiers, choke (if utilized), and certainly the smoothing capacitors and regulators (if utilized) all have a role in the sound of the power supply. cap input power supplies. That cuts both the primary power supply and the heater power, so it all simply stops and cools off. Diodes What to Buy I just used the UF1007 1000V 1A diodes recommended by Poindexter. Since September 2008 I've been working in a new project regarding a single ended triode tube power amp using the 811A vacuum tube. The external power supply should be placed as far away as possible from any other components or cables. I don't know if it's a difference in the tubes used or the power supply or what, but it's not subtle at all. Guitar Kits Vacuum Tube Circuits Planes Detailed instructions to build a DIY Vacuum Tube / MOSFET Hybrid class. High reliability and exceptional music - listening experience. HEATHKIT FM VACUUM Tube Radio Receiver Model FM-3A - $40. 5 V Standby. A DIY tube amp kit is the perfect gift for budding technicians, the bored partner who has everything, the solid state audiophile keen for a first taste of tube audio, even the dedicated tube-o-phile who has never built. Vacuum Tube Power Supply Kit.