The Amp Garage

Understood, that seems to be the consensus. Not really interested in the brand - was more interested in the unique design. All in all I think I’ll probably pass. I think moving a Boogie might be easier than moving a SC?

Now if it was an older DR504 I’d probably jump on it - but who wouldn’t, right?

Hi All, I have a couple of old Boogies for sale locally and got an interesting trade proposal a couple of days ago: my April ‘85 MkIII for a ‘72 Sound City 50 Plus. Been doing some research on this amp and it seems pretty interesting with separate bias pots for each EL34, active EQ, Hiwatt connectio...

Nice looking all the way around! Bet it rips.

That sounds like a useful option, thanks xtian! I may try that. Just for clarification: I was thinking the tail is the 39k that goes to the presence pot (R11 in the schem/layout) and that R13/1k is the cathode resistor. Do I have them reversed in my cranium? Still learning what everything does. Than...

I absolutely agree with you. One of the reasons I was motivated to start learning about amplification and electronics is because of the hyperbolic marketing surrounding everything out there - attenuators being a great example. I was lucky to have a few friends who let me borrow and test theirs; none...

So a month later after some break-in time I decided that I needed to tame the “swirl” I get on top of single notes some and dial back the gain just a bit; so today I tried the following “adjustments”: - Added a 22k grid resistor on V1A - Installed the 820R on V1B grid to volume pot - Decreased the V...

Interesting. My inexperienced electronics “eye” thinks it seems pretty simple… but that doesn’t mean much, lol. I’ve tried about a good half-dozen resistive attenuators out there (both well-known and lesser-known) as well as the PS and this simple design seems to be the clearest at high attenuation....

My PS-2 was altering the tone of my recent Liverpool build too much for my taste and my Mini-Mass was muffling it; even using the built in treble boost settings - so I decided to try the KF solution as documented in the TW Files section here. I have to admit after playing it on and off for 3 days no...

Thank you Sir! I appreciate the positive feedback - I’ve learned many things from your posts here as well; specifically on Marshalls. And I’m also a huge fan of your non-sequiturs! Great fun stuff. I always look forward to learning from you and having a chuckle at the same time. I’ve actually adopte...

All the PI values on the board are stock. The voltages didn’t seem out of the range and the sound seems fine. I’m still going to try some different preamp tubes and see how it goes. Right now I still have the tubes it came to me with in it: V1: JJ ECC83S “gold” V2: Psvane ECC83 V3: JJ ECC82 I did le...

So a couple of months ago I traded a Z-Wreck Jr for a 2204. Sort of a random, opportunistic thing. Had an ‘82 2104 about 10 years ago and didn’t really like the way it sounded; but didn’t know much about the “how’s and why’s” regarding amplifiers - so I moved it along. I guess I was a little curious...

Really innovative layout - but still looks TW at heart. Very impressive!

Wow, this is embarrassing. So I decided to double check the simplest things first and realized that Bergheim was absolutely right. My only explanation is that I had to do some creative bending to get the 1Rs positioned where I could reach them without shorting something else, and in the process of i...

So today I went ahead and fired everything up and got it good and warm. Then I measured the voltage from each OT plate lead to the center tap while running and got: V4: 1.358 V5: 1.276 Then I shut it down, drained the filter caps, and measured resistance from each OT plate lead to the center tap and...

Thanks lonote! I’ll print this out and stick it above my bench and let osmosis do its thing.

It’ll burn in eventually, but having the visual reference is great. Thanks again!