The Amp Garage

Thanks for posting. Enjoyed the Soundcloud.

Interesting that you are using an xFBxxx tank, as I am. I ordered the "correct" xEBxxx, it should be here in a few days.

Could you elaborate on your grounding scheme? I found it hard to pick it out in the photos.

Thanks,

Mark.

With Gain on 5, Master Volume on 7, and the loop bypassed, strumming the open strings gave a SPL of about 80 dBZ (an unweighted SPL reading). With the loop unbypassed but nothing plugged in the loop, SPL dropped to about 77dBZ. Maybe adjusting the attenuation would deal with this. Plugging the Ales...

Have you got the Nanoverb set for -20 or +4dB on the front panel? You’ve got a level pot on the input and the output of the ‘send’ CF buffer - why? If the one on the output is 500k, that completely counteracts the purpose / benefit of the CF’s low output impedance. Nanoverb does not have a -20/+4 d...

Sorry if I am hijacking this thread, but here is a progress report. I changed the loop circuit to the one posted by Ten Over in post #3. For the attenuation I used a 500K pot set as close as possible to the 470K/27K voltage divider. New circuit is shown below. Thanks to Ten Over for posting it. It s...

Hey Mike - I know its totally nuts but that's what it looks like re: 88k. I agree that an 8k8 would make way more sense. Screen capacitors appear to be in parallel. I assume it's a 20 uf & 32 uf tied together for ~50 uf. Hard to tell without unsoldering. Cap can is a 32 / 32. Part of me wonders if ...

95% of the overdrive will be around the output valve. There’s unlikely to be much overdrive in the preamp, certainly no hard clipping, unless the instrument’s signal is boosted somehow. So though an fx loop may get rid of the tone control shaping, it shouldn’t have much effect on the overdrive qual...

Hey Mike - I know its totally nuts but that's what it looks like re: 88k. I agree that an 8k8 would make way more sense. Screen capacitors appear to be in parallel. I assume it's a 20 uf & 32 uf tied together for ~50 uf. Hard to tell without unsoldering. Cap can is a 32 / 32. Part of me wonders if ...

What benefit do you perceive from the fx loop? Do you intend to reinstate the NFB loop at some stage? I don’t think that putting the fx loop inside the NFB loop would work out properly. Well, the idea would be to have digital reverb ( I really like the "hall" and "plate" digital reverb sounds, and ...

Thanks for starting this thread and for the schematics that have been posted. I have a 6V6 SE amp project going that currently is pretty close to a Champ AA764--master volume, extra node in power supply and some tweaks to the tone stack and V1A cathode resistor and cap. I would like to have reverb, ...

T Wilcox wrote: ↑Tue Apr 27, 2021 3:39 pm Finally got a cab built for this thing, still learning the hard way when it comes to tolex and have a few bubbles but it'll do

I like the design. What are the dimensions?

Looks like you received the Benson speaker......

Perfect bedroom volume. :) Feature it is then 8) I played a bit. The signal is being picked up somewhere in the PI -> power tube circuit, on the half that is feeding the trim pot. If I disconnected the grid on that half of the phase inverter I got no sound with the volume turned off, and normal (qu...

I read somewhere Benson uses .02 on the whole power amp on his production Monarch amps but his personal amps still uses .1. From his 1st post here... I'm bored on a plane and came across this. I must say I'm flattered to join the ranks of traced stuff on here...I've used this forum as a resource ma...

I had the house to myself so was able to crank it up to 5. This time I played a guitar with humbuckers, and yes it has some drive. Take my comments with a grain of salt as I have a lot of high frequency hearing loss. So I don't hear the full harmonic content. Having said that, I keep coming back to ...

Moving the ground for the balance pot waaaay down to the end w/ the preamp ground does seem to have gotten rid of the bad hum... but also introduced a far more irritating oscillating click and static... I have the power amp grounded to the same lug as the CT for the PT primary - is this a bad idea?...

Hrm... well, made the following changes to mine tonight: Added a 4th node, and switched to 22/47/22/22 with 4.7K between nodes B and C and C and D. Sent node D to the preamp. Sent grounds for nodes C and D to the same ground as the preamp. Swapped V2 pins 2/7. Replaced the 1K resistor on the reverb...