The Amp Garage

If you pull up the RCA tube manual then near the back you will find a chart that will cover all of your questions in full! Heck, then I guess we don't even need this forum. Well, I do use the tube manual frequently but I still really enjoy hearing other opinions when it comes to the sound of a circ...

Works great - the only difference being that it now has much more headroom esp. At bedroom volumes. There is tone and overdrive behavior change, but overall sounds good and gets the job done. Niki Hi Niki- Interesting that there is more headroom when you lower the voltages to the tubes of the whole...

I have an amp with a power supply similar to a typical 'wreck with parallel 47uF caps for the first node. With some guitars the amp is a little stiff and with some it is perfect. I had an idea to switch the ground of one of the caps so I could switch from 94 to 47 on the plates. I would probably pl...

There's one on eBay now, but bid starts at $50 and shipping is close to $30. I just love the look of those. I want to use one for my three channel preamp project. They are cool looking but be aware that they are very small inside! The OD LXDXH is about 9X7X4 but the ID seems much smaller because of...

Here is an example of reducing potential switching noise using caps.

http://www.valvewizard.co.uk/bridge.html

Thanks Phil. I'm going to put it into an existing chassis that's about 7x10". I'll use something similar to the first two stages then use the third stage for a cathodyne splitter into 2 6k6s. It too may be too tight & noisy but I'll let you know what happens.

Scott

I found this schematic that I think I would like to try but can't find any coments about it here with a search. Has anyone heard this in action? Is this amp from the same Phil_S that I see here sometime?

Thanks.

http://home.comcast.net/~psymonds/Octal ... l3Fat.html

I found this schematic that I would like to try but can't fine anything about it here with a search. Has anyone heard this in action? Is this the same Phil_S that I see here?

Thanks.

http://home.comcast.net/~psymonds/Octal ... l3Fat.html

Edit:( Moving) posting to correct forum

I'm thinking that non inductive resistors are good at high impedance places that don't have high voltages across them like the grids. (read that on one of the good sites around here, don't remember which one) Not sure about G2 though since they aren't so far from AC ground. I'll be watching for a go...

Interesting. I'm not up on that circuit but I would think it had something to do with a R/C time constant that works inverted but I don't see any huge caps. Must be the actual circuit that does it. I would like to know as well. Structo- I changed all the tubes, electrolytics and selenium rectifiers...

Structo wrote:Interesting.

I'm not up on that circuit but I would think it had something to do with a R/C time constant that works inverted but I don't see any huge caps.

Must be the actual circuit that does it.

I would like to know as well.

I will work on it this weekend & let you know what I find-

Bought a 1954 variable power supply for breadboarding my amps. It slowly drops voltage over time. From 300 VDC to 280 v in 1hr. Other than tubes and electrolytic capacitors in general, any ideas on what part or block might cause this. Schem attached.
Thanks!

surfsup wrote:I have a VVR now that scales the whole amp and am considering scaling only the power section at this point instead to see if I hear the difference.

How does the whole amp scaled vs power amp only sound?
Thanks

SeanA wrote:It is a nice sound, but not your "classic" strat tone.

Do you feel that is due more to the chamber or the wood?

As far as the reason for knocking the input triode signal down to ~1/20 ... look at the Supro s6424 it has the same input stage but the input stage goes directly to the phase inverter not into another triode. Thanks for the amp pointer. But, why build it up then knock it down that much? (It isn't a...