- Jan 17, 2009 · The firefly I've got has 2 12ax7's and a 12AU7 in "self-split" mode, which is some bastardization of single ended (usually class A) and Push-Pull (Usually class AB) It's supposed to sound quite "Marshally", in a 70's context, I believe.
- 12AX7 (also known as ECC83) is a vacuum tube that is a miniature dual-triode 6AV6 with high voltage gain. Developed around 1946 by RCA engineers in Camden, New Jersey, under developmental number A-4522, it was released for public sale under the 12AX7 identifier on September 15, 1947.
- Project Cntry Main Page Description Parts Tubes Type Subtype; 1: AM Modulator: US : T Williams Schematic Only : 20: 12AU7, 6BA6 (2) AM Ham Transmitter: 1 - 5 Watts
- I tried a bunch of different 12AX7's in that stage. The new-issue Tung-Sol and Electro Harmonic tied for least noise (the worst tubes were a long-plate Zenith on noise alone, but a GE I tried couldn't get over MV of 3 before it started squealing).
- The Firefly is one of the smallest guitar amp kits created by the AX84.com cooperative. It's a three tube design built around a pair of 12AX7 tubes and a... Electronics Projects Elektronische Gadgets Radio's Buizenversterker Amateurradio Luidsprekers Mieren Tecnologia
- The 12AX7 will happily eat up whatever you can feed it. It can handle up to 300 volts on the plate. For ideal tone you'd want to live in the 200 volt area, but they can be run "cold" with as little as 20 volts and still produce a sound. Normally, the 12AX7 dissipates a maximum of about 1 watt, so you're not dealing with a ton of power here.
- EMI Audio 4719 42ND AVE N Minneapolis, MN 55422 Store Hours - Mon-Fri 10am-5pm, Sat 10-2pm; 612-789-2496; Sign in or Register
Firefly FFTH $250 pic hide this ... Assorted Tubes (EL34, 12AX7, 12AT7) ... Blackstar Series One 10AE tube amp $380 pic hide this posting restore restore this posting ...
- Sep 12, 2007 · The Firefly is a 1W tube amp using a 12AU7 in push pull operation. The low gain preamp is a two stage cascaded 12AX7. The amp has a boost switch and gain control which really makes that little sucker crank. The boost is accomplished through a cascode 12AX7 circuit that really provides some over the top gain.
- The Radial Firefly™ is a high output tube direct box designed for stage and studio. It combines Radial's award winning zero negative feedback class-A front end with the warmth and character of a 12AX7 tube drive circuit and Radial's legendary transformer coupled output. Firefly Tube direct box. Class-A front end drives 12AX7 tube stage
- Australian Mutual Provident Society Building (2,273 words) case mismatch in snippet view article find links to article 1938. It was the second building in Townsville to be purpose-designed for the AMP as its North Queensland regional office. The Australian Mutual Provident
- This amplifier is in excellent condition - like new. The Vibro-Champ XD amplifier takes a winning amp formula into the new era by combining a real tube amp with versatile digital voicing and effects. The Vibro-Champ guitar amp of the 1960s and '70s was an upgraded version of the venerable Fender Champ® amplifier.
- Nobsound Little Bear T11 6N2/12AX7 Vacuum&Valve Tube Phono Turntable Preamplifier; MM RIAA LP Vinyl Record Player Preamp; Stereo HiFi Audio Pre-Amplifier. The rectifier tubes are good, but the signal tubes (12AX7 and 12AU7) are best changed to better quality.
- Firefly 1watt 12AU7 tube guitar amp. Saved by David Smith. 20. Diy Guitar Amp Guitar Pedals Vintage Guitars Minis Bass Tube Audio Products Circuits.
Now plug your favorite speaker into the reverb transformer jack (use adapters or whatever you need). Next pull the PI tube just to kill the main amp. Plug your guitar into the VIB channel and set controls as desired. Basically what you have is a Fender preamp playing into a SE/parallel 12AT7 power amp connected to your speaker.
- The Mesa Boogie Mark Five: 35 Amp Head is the link between the flagship Mark Five and the small Mark Five: 25 With 2 channels the amp covers a large area, each of the two channels can be operated in 3 sound modes.
Fender Chion 40 Guitar Amplifier with CoverSerial CGPF1900519740 Watts Output into one 12 SpeakerTwo Channels, Amp modeling on channel 2, Effects active on both channels.Like New, comes in the original boxThese sell for $199 Tax, cover is an additional $25.A support board was added to the back allowing it to be used on an stand.Amp only weighs ...
- The Radial Firefly is a high output tube direct box designed for stage and studio. It combines Radial's award winning zero negative feedback class-A front end with the warmth and character of a 12AX7 tube drive circuit and Radial's legendary transformer coupled output.
- firefly amp. 4.69%. bias calculator. 4.09%. bbs forum. 3.91%. Top Keywords . ... what is the difference with 6sn7 tubes and 12ax7 tubes in a preamp. 4 Avg. Traffic to ...
- DIY amp parts and kits. Specializing in vintage tube amp replacement parts for Fender, Marshall, Vox and other guitar amplifiers.
Sep 27, 2020 · I got a Sovtek, Tungsol, and Mullard 12ax7 and a JJ EL84 in the mail today that I plan on trying out before I change the speaker though, just for experimental purposes. Even with the extra tubes and speaker mod it'll only cost me $150, so a it's a fun project and good introduction to tube amps for the cost of a solid state.
Jun 08, 2010 · So the MiniAmp started as a AX84 FireFly without the cascode boost-stage with one 12AX7 in the preamp and a 12AU7 in the poweramp in a self-split push-pull configuration. After researching the parts (transformers etc.) I decided to use a Hammond-style BB-type enclosure. You will find the unmodified FireFly schematic here on AX84.
I was wondering if the 12AX7 and 12AX7A are interchangeable? If there any advantage of using one over the other. I have been reading some things online but I am still a its creeping into the boutique amplifier market as well. I just spent 2 grand on a very toneful amp and noticed a plastic input jack.
Ενισχυτής κιθάρας HEAD 100W υβριδικός, προενίσχυση Valvetronix με 11 μοντέλα ενισχυτών & 11 ψηφιακά εφέ, VOX Valve Reactor με λυχνία 12AX7, VOX Vari-AMP power circuit για ρύθμιση ισχύος εξόδου (1-100 watt), ειδικής σχεδίασης 2x12 ...
- Initial impressions on the Treasure 12ax7-LS in the critical phono preamp application are positive (George Wright's WPP200C, 2 x 12ax7 per channel Put the new tubes in and turn on, first 10 mins, comparing to Psvane 12AX7-TII…the new super tube has lower noise floor, sound is more dense and...
- Electro Harmonix 12AX7 Eh Vacuum Tube. €20. ... PageFlip Firefly Bluetooth/USB Pedal Footswitch. ... Modeling Guitar Amplifier. €874. In stock for E-shop.
- EMI Audio 4719 42ND AVE N Minneapolis, MN 55422 Store Hours - Mon-Fri 10am-5pm, Sat 10-2pm; 612-789-2496; Sign in or Register
- Download now. SaveSave 12AX7 6V6 Single Ended Class a Tube Amplifier Desi... The 1M resistor maintains a path from grid to ground regardless of the state of the input of the amplifier, preventing potential damage to the driver tube caused by source failure[4]. In addition, the Miller capacitance of...
- Dec 25, 2008 · That Jolida quad 6550 push-pull amp is feeding just the front two main channels of my surround system. The other 4 channels are fed via a vintage Yamaha DSP-1 Sound Field Processor (a rare treat, even in this day of Dolby 5.1 Surround), and Yamaha M-35 4-channel power amplifier, seen behind the glass in the rack.
- Published on 01/25/10 within Phonic Firefly 302 Phonic announced Windows 7 and Mac OSX 10.6 Snow Leopard compatibility for the Firefly 302 USB and Helix Board 12 Plus. [NAMM] Novation Nocturn 25 & 49 Published on 01/25/10 within Novation Nocturn 25 Nocturn Keyboard is based on the control surface of the Nocturn. With 25 and 49 note keyboards ...
- Alibaba.com offers 1,023 12ax7 amplifier products. About 15% of these are Amplifier. A wide variety of 12ax7 amplifier options are available to you, such as usage, channels, and type.
- Gain and Volume controls. 8Ohm16Ohm speaker out selectct. Full metal construction. Power Output: 5 Watts. Preamp Tube: ECC83(12AX7) x 1, ECC81(12AT7) x 1. Power Tube: 6V6GT x 1. Power Requirements: 100-120V 50/60Hz FUSE: T1AL/250V 220-240V 50/60Hz FUSE: T0.5AL/250V. * Bassman® is a famous amplifier model of Fender® Musical Instruments ...

The Firefly uses two 12AX7's for 2 or 4 stages of gain (switchable) and uses a 12AU7 in self-split push-pull mode for power. It sounds surprisingly good through an Eminence 620H 6" hemp coned speaker and an extension cab with a Weber Vintage 12A125A 12" AlNiCo speaker . Headphone amplifier and 12AU7 tube is powered by just 12V DC voltage. This is great news for those new to vacuum tubes that want experience… DIY Preamplifier kit based around the common 12AX7 dual triode valve (vacuum tube). Line level (Hi-Fi) preamplifier kit with gain set at 4 (6 dB).

Firefly 12AX7 Amplifier PCB $19.00 This is the Rev. 8 PCB for the Firefly 12AX7 amplifier. These are professionally made, double-sided, drilled boards with plated through holes and silk-screening on the top.
I tried a bunch of different 12AX7's in that stage. The new-issue Tung-Sol and Electro Harmonic tied for least noise (the worst tubes were a long-plate Zenith on noise alone, but a GE I tried couldn't get over MV of 3 before it started squealing).
- It combines Radial's award winning zero negative feedback class-A front end with the warmth and character of a 12AX7 tube drive circuit and Radial's legendary transformer coupled output. The Firefly features A and B instrument inputs
- 12AX7 high-mu twin audio triode. T. he Svetlana™ 12AX7 is a miniature glass-envelope small-. signal dual triode intended for use as a low-noise preamplifier for audio applications. It is a direct plug-in replacement for any 12AX7, 7025 or ECC83 in music or audio amplifiers. All ratings of the Svetlana...
- Using 12ax7's in the pre-amp will ultimately make the power stage a bit louder as it has more gain, and probably provide more power stage compression I haven't yet found a reason not to use 12ax7's instead of 12au7's though, unless 12au7's are better current amplifiers... I've actually built the firefly...
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- Download now. SaveSave 12AX7 6V6 Single Ended Class a Tube Amplifier Desi... The 1M resistor maintains a path from grid to ground regardless of the state of the input of the amplifier, preventing potential damage to the driver tube caused by source failure[4]. In addition, the Miller capacitance of...
- Preamp tubes: 3x ECC83 / 12AX7. £209. Available immediately. Available immediately. This item is in stock and can be dispatched immediately. Standard Delivery Times.
- 12AX7 ET-T509B Page 1. Description and rating-. The 12AX7 is a miniature high-mu twin triode each section of which has an. BASING DIAGRAM individual cathode connection. sistance-coupled voltage amplifiers, phase inverters, multivibrators
- ZOOM G9.2TT REAL 12AX7 TUBES GUITAR EFFECTS PEDAL ... Firefly Double Cut Electric Guitar $150 ... Ashdown ABM810 8x10" 1200w Bass Guitar Amplifier Amp Cabinet Cab ...
- The Epiphone So-Cal 50H is a boutique-quality guitar head amp at a remarkable price point. Sublime tonal quality with hummless performance because of DC-powered valve filaments and superb definition from a solid-state rectifier make the Epiphone So Cal 50-watt one of the finest amplifiers we've had the pleasure to play through.
- The Radial Firefly is a class-A direct box that combines a 12AX7 tube drive with transformer isolation to deliver spectacular warmth and character. PZ-Pre Resources Part no: R800 7085 00
- The Woo Audio WA7 "Fireflies" Amp/DAC is a combination of high performance vacuum tube headphone amplifier with a built-in USB Digital-to-Analog Despite its incredibly compact size, "Fireflies" is a power-house with the capacity to drive almost any demanding audiophile headphones.
Firefly 30DSP Schematics Flying V Bass Wiring Diagram ... GA-30 (12AX7) Schematic GA-30 12AX7 PREAMP Schematic GA-30 65J7 PREAMP Schematic GA-30 Invader (6SJ7 ...
- The Trinity 18 is based on the Marshall 18 watt design and uses a pair or EL-84 output tubes, 3 12AX7 preamps, and an EZ-81 rectifier. It is a Cathode Bias, all-tube design using a tube rectifier. Details

Amp Yamaha G100-210 Guitar Amplifier and Switch Pedal ... "Firefly FFPTH Semi-Hollow Telecaster/ Guitar/Brand New"(LQQK) ... 12AX7 12AU7 Groove Tubes and vintage for ...

Firefly 12ax7 amplifier

Alesis Strike Amp 8 Alesis Strike Amp 8, active e-drum monitor, 8" Woofer, 1000W RMS, 2000W Peak, 126dB max., 2x xlr/jack combination input, xlr link output, frequency range: 62Hz - 20kHz, measures: (WxDxH) 434x256x245mm, weight: 9.2kg The preamplifier is based on a pair of 12AX7 tubes and the power stage is a class D amplifier that is rated at 500 watts at either 4 or 8 ohms. This head unit fits in with the whole “Tiny” theme. It measures a scant 12 x 7 x 6 inches, and it comes in around 11 pounds.

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Find and follow posts tagged 12ax7 on Tumblr. line amplifier board for a control amp. this is obviously not the way the circuit board was intended to be used. it's a bit of a mess, but i just tested it with power for the heaters and electrodes, and it seems to be working.

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