The Amp Garage

pedalguru wrote:.......

Good point.

Merlin mentions why in his LTP article (albeit the DC version) on his site. From that article: The cathodes of the two triodes are connected together, and one grid is usually grounded at AC. The first triode acts as both a normal inverting gain stage, and as a cathode follower. The signal on the cat...

Did you consider just going point-to-point on a few of those parts? For example, the .1uF and .47uF caps from the socket to the Send/Return pots? FWIW, I just made two extra nodes off of the screen supply, the first node is unused and the second node is for the whole loop. This allowed me to mount t...

WOW!!! That is why I love this place!!! Thanks you very much...I totally missed that! It just goes to show sometimes you need a fresh set of eyes! I will fix that tonight and let you know the result. Thanks again Jody We all do it, sometimes that's all we need, fresh eyes. I'm about to build one of...

I think you have pin 1 of V1 connected to the wrong end of the 220k plate resistor. That explains the too high voltage on pins 1 and 3 of that tube (and the 'almost' no sound).

The circuit looks different enough to consider it not an AC30 Top Boost (or Rocket) type circuit. AFAIK, the AC30 Top Boost and Rocket have 2 gain stages then a cathode follower driven tone stack and the tone stack is different (1M pots and a 50pF treble cap among other differences). Maybe play with...

Nice looking build Mark! I think I like the rectifier and OT placement better on the Z-wreck. Less 'right-heavy' and easier access to the tube. How much of a difference does the Speed/Comfort switch make? Anyone have a definite preference for Speed or Comfort? Wonder if there is a specific reason fo...

True but I don't really care about any of that 'associated with/used in real 'Wrecks' stuff.

The MM iron is very good in my experience and I have purchased enough that the quantity discount makes them competitive. I can't see why a dealer such as myself wouldn't pass on some of those savings. Yeah, I used a dealer for my Rocket OT (Vox Woden-clone) and it was under $200 shipped. dartanion,...

I just checked my three 12AX7s on my VTV tester. One is higher gain than the other two but the triodes are not as well DC balanced, so that goes in V1. One of the remaining two is well balanced, best of the three, maybe 1VDC between triodes, that is going in the PI. The third one is not that badly ...

Just my opinion but compared to the cost of the entire amp, the extra cost for MM trannies isn't that huge. And if you're trying to build the absolute best amp you can, why not get the best? Now; I'm not saying MM trannies ARE better sounding, I don't know. But IF I thought they were I'd spend that ...

Is the 100k in series with the trimmer? And is that a 1M trimmer?

Now that I think about it, I don't think I've ever had my 500k-A HRM bass control as high as 5. Next time I'm in there I might try a 470k-1M in parallel with it.

Yeah, I can see it being easier to dial in. The 1M pot is only too bassy if you turn it up too much. But there's that ON/OFF thing that can make it difficult to dial in. The 20K mid pot is correct. The 100 ohm resistor could just have been "what HAD had (!)" He knew where exactness mattered and wher...

Shouldn't be getting any noise whatsoever when on Standby. Should be dead silent. Are you sure the Standby switch and power supply are wired correctly? Measure voltages while in Standby, you should get heater voltage and DC voltage up to the Standby switch but no voltage anywhere else. OT center tap...

Hi all, I'm happy to say that I've got this thing up and running again. I brought home a tiny mirror from the office and had a look underneath. Low and behold the wire had disconnected to B+4. Boy was that fun to put back in, with everything else connected already. I had my wife holding the mirror ...