The Amp Garage

add grid resistors downstream and reduce the values of the coupling caps to reduce low bass, esp. early in the circuit. see if the filtering is sufficient I messed a little bit with coupling caps, but preferred what the smaller cathode caps did in this circuit. There is a nice clear bass that I can...

add grid resistors downstream and reduce the values of the coupling caps to reduce low bass, esp. early in the circuit. see if the filtering is sufficient

those who have switched between two larmars have simply used two 500k stereo pots in parallell, which gives about the same resistance as single 250k stereo pot. Instead of the 2m2 security resistors on the 250k you may need to adjust the value of the security resistor. but don't be too mechanincal, ...

Looks great. and reminds me that I have a cab and chassis and lots of NOS 7581as waiting (need transformers)

I've tried running a superlead with a 500ma ht fuse instead of the normal 1a. it ran for many hours without blewing

do these amps draw more current than a jtm45?

This is delving into hazardous testing, which you may not have done before, in which case imho you should work with a competent person to raise your experience. The commonly used technique is to insert a 1kΩ resistor in series with the filter cap and clipping a handheld multimeter across the resist...

rootz wrote: ↑Sat Apr 13, 2024 2:32 pm Here's the bastard son of the 005 and Odyssey power amp.

nice idea for EJ tone! any schematic or layout?

I’m working on a JCM-800 and I find that the bias voltage ranges from -58VDc to -42VDC. I have tried the EL-34’s that the amp came in with and a new set. I find with a new Marshall branded set if EL-34’s the maximum they will pull is 27mA. The bias circuit is incredibly simple. A diode, two resisto...

[Franchesca (Express "85") had Clarostat PC style pots throughout where both Ingrid (Express "92") and the Liverpool from Funks images have a mix of Clarostat, PEC and Mil-spec AB's but in similar layouts. The 1megs used for volume appear different than those used for treble etc. I would be interes...

[Franchesca (Express "85") had Clarostat PC style pots throughout where both Ingrid (Express "92") and the Liverpool from Funks images have a mix of Clarostat, PEC and Mil-spec AB's but in similar layouts. The 1megs used for volume appear different than those used for treble etc. I would be interes...

the problem is with the grill cloth

some 2204s had low voltages originally (around 370v)

This solution can be used on the screens together with an ordinary capacitor input on the plates but that requires two rectifiers

we need a new clip!