Missing back plate EL-84 adapter installed, can run 6V6 too. Clean channel sounds incredible when turned all the way up. Overdrive channel is loud, I played a couple of small shows with the amp and it kept up. VHT chromeback speaker in closed cabinet. In my opinion the amp sounds better with the el84 tube since the chromeback speaker is mid heavy.

Vintage EICO HF-12 12-watt mono tube amplifier, previously modified from its original hi-fi configuration for apparent guitar/instrument amplifier use. This is an interesting restoration or further-conversion project for a tube guitar amplifier builder or vintage audio enthusiast. CURRENT CONFIGURATION – Original EICO HF-12 chassis, enclosure and transformers. Original four-position input selector removed and replaced with a front-mounted 1/4-inch input jack. Three remaining front controls: volume, bass and treble. Original rear audio inputs removed. Rear 1/4-inch speaker output jack added. Original speaker terminal strip remains, with altered connections. The 8-ohm terminal is presently unwired. Original decorative front faceplate is missing. Replacement Mallory electrolytic capacitors installed. Three-prong grounded-style power cord installed, but protective grounding has not been verified as satisfactory. Other previous wiring and component changes are visible. ELECTRICAL TESTING PERFORMED The amplifier has NOT been powered up or audio-tested. Resistance and continuity measurements were performed with a multimeter. Output transformer: – Primary end-to-end: approximately 341 ohms – Primary halves: approximately 187 and 154 ohms – Secondary G-4? : approximately 0.9 ohms – Secondary G-16? : approximately 1.3 ohms Power transformer: – Primary: approximately 40 ohms – Heater winding: approximately 0.4 ohms – High-voltage secondary: approximately 205 ohms total – High-voltage secondary halves: approximately 105 and 98 ohms No open windings were identified in the circuits measured. These are resistance/continuity measurements only and do not establish transformer performance under operating conditions. IMPORTANT ELECTRICAL CONDITION The three-prong power cord was checked for continuity between its grounding pin and the metal chassis. Meter lead resistance: approximately 0.2 ohms – Grounding pin to chassis: approximately 2.5-2.7 ohms The protective chassis-ground connection requires further inspection and verification. The power wiring, capacitors, previous modifications and overall electrical safety have not been fully evaluated. DO NOT CONNECT TO AC POWER UNTIL PROPERLY INSPECTED AND SERVICED BY A QUALIFIED TUBE-AMPLIFIER TECHNICIAN. RESTORATION POTENTIAL The EICO HF-12 originally used a push-pull EL84/6BQ5 output stage rated at 12 watts in its factory configuration. The existing instrument-style conversion offers an interesting starting point for a vintage guitar amplifier project. Actual instrument input characteristics, operating condition, output power and sound have not been verified. The amplifier could also be considered for restoration toward its original hi-fi configuration. This would require sourcing missing controls, connectors and faceplate components, tracing the wiring and making appropriate circuit repairs. Not represented as a working or electrically safe amplifier. Includes the amplifier and installed components as photographed. No additional accessories are represented as included. Please review the detailed photographs of the chassis, underside wiring, transformers, controls and connections.

Description: Vintage Admiral 5T4A mono-block tube amp with a push-pull pair of 6BQ5 / EL84 output tubes. Solid platform for a low-watt guitar amp build or recording amp. Strong transformers and a clean push-pull EL84 layout make this an excellent foundation for a great-sounding low-watt guitar amp. Powers up and plays well with strong, clean output. Serviced in the past (electrolytic & coupling capacitors replaced). See under-chassis photos for details. Push-pull EL84 / 6BQ5 output stage. Console pull / mono block format. For Guitar Use: Great candidate for a custom build. As with most console amps, you’ll likely want to modify the input, tone controls, and grounding depending on your setup. Good iron and straightforward layout make it a strong platform. Sams Photofact (schematic + parts list). Vintage electronics – may need additional service depending on use. Photos are part of the description.

The product is a vintage ELK 1-12 guitar amplifier from the 1960s or early 1970s, The original circuit board was removed. I was ask to build a prototype of an 18 watt with only a volume and a tone control. The company send me three amps to build off of, when everything was said and done. They gave me this one, because they decided to build heads and not combo amplifiers. I got it out this week to test. It’s been in storage for many years. There is a little transformer hum. I played it for a hour plus last night. Nice pick attack, a great sing to the notes. It features an EL84s and two 12AX7. Has about 18 watt’s power output. A solid wood cabinet, around the size of a black face Dlx. All sales are final. Please look at May other items.

Description: Vintage Admiral 5T4A mono-block tube amp with a push-pull pair of 6BQ5 / EL84 output tubes. Solid platform for a low-watt guitar amp build or recording amp. Strong transformers and a clean push-pull EL84 layout make this an excellent foundation for a great-sounding low-watt guitar amp. Powers up and plays well with strong, clean output. Serviced in the past (electrolytic & coupling capacitors replaced). See under-chassis photos for details. Push-pull EL84 / 6BQ5 output stage. Console pull / mono block format. For Guitar Use: Great candidate for a custom build. As with most console amps, you’ll likely want to modify the input, tone controls, and grounding depending on your setup. Good iron and straightforward layout make it a strong platform. Sams Photofact (schematic + parts list). Vintage electronics – may need additional service depending on use. Photos are part of the description.

I’m letting go of a few things from from my collection, including this Audiotronics model 300 vintage tube amplifier amp project. Will make a killer guitar amp. If you like the Filmosound stuff, and single-ended amps, this one is great, rare and has a cool look with that front panel, just tweak the circuit and add your preferred controls. Has nice Triad power transformer, good sized output transformer, 6×4 rectifier, 6bq5 (el84) power tube, and a 6av6 preamp tube. Looks to be in stock form. Not currently in a working state.

I’m letting go of a few things from from my collection, including this Heurtier HSM 6 watt vintage magnetic film tube amplifier project. Will make a killer make killer guitar amp! If you like the Filmosound amps, this is right up your alley. The amp needs typical updates like new. Servicing, checking/replacing capacitors as needed, and desired mods/conversion. Comes with pictured vintage tubes.

Tube Amplifier Sandwich EL84 Vintage Audio Component.

Correction: This amplifier is an EICO HF-32, not an HF-81. The listing has been updated accordingly. Vintage EICO HF-32 integrated tube amplifier paired with matching HFT-90 FM tuner, classic American hi-fi components from the golden age of tube audio. Featuring mid-century industrial design, point-to-point tube architecture, and collector-grade aesthetics, this untested EICO amplifier and tuner set is ideal for vintage audio restorers, tube amp collectors, and enthusiasts seeking authentic 1950s-1960s high-fidelity equipment. Models: HF-32 Integrated Amplifier & HFT-90 FM Tuner. Model identification has been carefully verified against chassis markings and faceplate labeling. Era: Late 1950s-Early 1960s. Type: Vacuum tube hi-fi components. Condition: Untested / As-Found. Included: Amplifier + Tuner only (no accessories). Stereo (2-channel integrated amplifier). Country of Manufacture: United States. Some machines are built to be used. Others are built to be. This pair belongs to the latter. The EICO HF-32 is a well-regarded integrated tube amplifier from the American hi-fi era, appreciated for its musical warmth, straightforward design, and the unmistakable character that early tube circuits deliver. It is the sound of living rooms where jazz records spun late into the night, where voices came through the air with presence and humanity, not compression. Paired beside it is the EICO HFT-90 FM Tuner, a companion piece that completes the picture – a reminder of a time when radio was not background noise, but an event. Together, they form a visual and historical symmetry that collectors seek but rarely find intact. Look closely and you’ll see the story written in metal and paper: the perforated steel cages, the understated typography, the surviving schematic labels still clinging to the underside like handwritten notes left behind by the engineers who built them. They are the difference between equipment and artifact. This set has not been powered on. Tube audio collectors understand that preservation comes before assumption, that restoration is a personal journey best left to the next steward. What is offered here is honesty – untouched, unaltered, and ready for the hands of someone who understands what they are holding. This is not a shortcut to sound. It is an invitation to history. Professionally packed with care appropriate for vintage electronics. The HF-32 occupies a respected place in EICO’s tube amplifier lineup for a reason. HF-32 is often spoken of in reverent tones for a reason. It occupies that rare intersection of engineering excellence, musicality, and aesthetic restraint that modern equipment rarely attempts. When paired with its matching tuner, it transcends utility and becomes a statement – a moment frozen in the golden age of American hi-fi. Opportunities to acquire a matching EICO amplifier and tuner pair, preserved in this state, do not present themselves often. This is a piece for the collector who values authenticity over convenience, and legacy over immediacy. Collectors familiar with EICO’s lineup will recognize exactly where this piece fits.

Quad of EI Mullard EL84 6BQ5 Made in Yugoslavia Vintage 1968 Vacuum Tubes. Test good on my tester. I removed from a working Vox AC30 guitar amp I owned a number of years ago. Date codes appear to be KM4 Q(not actually a Q but a similar looking character which represents Yugoslavia) 81 which indicates Nis, Yugoslavia 1968.