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VHT has stopped printing component labels on their circuit boards. With the boost control you either have 68k ohms with boost or 0 ohms with no boost (clean). The stock 12AX7 preamp tube in it and it sounds good.
R10 and R12 function as a bass control. 560 Ohm resistor is soldered to hot side of R39 and toggle switch mid terminal. I like the darker, smoother sound of the hemp-coned Eminence speakers. The speaker was $27 from MCM Electronics. VHT amplifiers have been around for 20 years and are best known for it's boutique range of amplifiers.
Also be sure and twist the choke lead wires to minimize noise. Low Power mode is perhaps a little disappointing by comparison, but still capable of yielding usable sounds. Convert the Boost Switch Into a Raw Switch. If you can access that capacitor, crocodile clipping other caps in parallel with it would allow testing different values until you're happy since capacitors in parallel combine their values. I went with a high quality purpose built Godlyke Power-All 9 volt Basic Kit. 3v DC filament heater circuit for both preamp tubes. 16 Ohm 10" speaker for VHT Special 6 for low volume, cleanish tone. Joined: Fri May 20, 2016 9:42 pm. The mid control is the least effective so adding just the treble and bass controls will reduce complexity and give you more space to work with. Our Gear Advisers are available to guide you through your entire shopping experience. Available since February 2011. White wires run to new tone pots. Schematic With Block Functions. It's not much different from what most people would pay for a similar amp--5 watt class A circuit with 12AX7 preamp tube and an 8" or 10" speaker--from Crate, Epiphone, Fender, Peavey, etc., with mods from a respected harp amp tech. The reverb pot has a 1/4" smooth shaft.
Many are describing excellent tone, distortion and controllability along with the most volume possible. And the amp need a. line out for PA support. Gold Coverage Includes: - Unexpected and unintentional spills, drops and cracks. Speaker, which isn't meant to color the tone, then go head and line. This amp sounds fantastic but I bought it to mod it and learn tube amp theory. I recommend leaving one of the handle screws as last, then turn the cab on its side and make sure you have a good grip on the chassis as you remove the last handle screw--it's heavy and you don't want to let it drop out of the cab. Vht special 6 speaker upgrade device. I picked up some 1 inch tall rubber feet on eBay to replace the amp's short feet to raise the amp off the floor to give room for the speaker grill.
Played this with the band on Thursday; an educational experience... Godlyke Power-All 9 Volt Wall Wart. The power amp is the traditional single-ended 6V6 valve output stage, employing cathode-bias, ie the amp is self-biasing. The Ultra even uses a quiet 6. I. know that may go against conventional wisdom, but side by side... VHT SPECIAL 6 (Upgraded with 6L6GC, JAN 5751 tubes and | Reverb. The Special 6 Ultra also features an all-tube buffered effects loop. The existing blue cable leading to the tube has to be removed. So I'm looking for a 10" 16 Ohm speaker (not that common it seems) that isn't harsh or biting, icy, rather something more mellow for warmer, clean(ish) tones. Godlyke Power-All heavy duty 9 volt power adapter opened. You can locate R38 by following the wire connected to the power tube socket (V3) pin 5. 12ax7, 5751, 12at7, 12ay7??? Connect C17 to the mid pot's pins 2 & 3. If you want a properly distorted tone from this amp you'll need to use either the Low Power mode or a pedal, or both. I do think the 10" speaker makes a difference--I'm about ready to declare that 10" speakers are tops for harp, period.
We pinch off the two capacitors C11 and C12 and the blue wire at the soldering points as close as possible. One note about using the Ultra, the amount of control offered with all the sound shaping knobs can be overwhelming. Any advice would be great. This allows high frequencies to bypass the tone control at lower volume. VHT Special 6 Ultra All-Tube Electric Guitar Amplifier Head Amp NEW. 022uf / 400v, C10 to. Later I went back and twisted the AC power wires running from the On/Off Switch to the power pack to minimize 60Hz hum and noise. Came across VHT's Special 6, and it seems just the ticket, being basically a Champ, while most other affordable low watters have EL84 power tubes. What tubes would you guys suggest I use for the preamp section? If you're like me and your cab has a 16 ohm speaker you can drop the impedance by plugging a second speaker into the Ultra's second speaker jack.
Where the amp can be improved is in shifting the voice downward, and. 3 uF (this effects only the Ultra channel). If people are saying they like the difference, then maybe it's worth trying. Personally, I don't see huge benefit in putting more money into the. R12 and R10 adjust the treble and are replaced by the potentiometer, get rid of it.
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