The Amp Garage

Regarding the reverb ...... it works fantastic I've never tried a reverb wired this way, but I couldn't imagine, that it will work w/ just a 100K (or 150K on the other schem) between the Send & Return of the reverb area. It's been just my thoughts. But if it works (as you say), I can imagine, that ...

Can you take a look at this and clarify what you're saying, please? I am probably missing something obvious but I'm seeing the cathode cap and resistor in series to ground. http://www.el34world.com/Forum/index.php?topic=4437.0 I'm not sure I am following you??? The cathode switch in your schem isn'...

roberto wrote:The added supply cap it's something around 47uF?

The 1-st screen filter cap is a 50µ (below the board), the 2-nd after the rheo is a 20µ/550V from TAD.

Larry

Ah, you've posted another schem a minute before I posted, where the switch now is removed. But another prob is, that you won't hear much of the reverb, because the dry mix R between R & R2 of 150K (former 100K) is way too small. You'd at least need a 2.2M there, and a smaller Reverb pot, to come to ...

Maybe you've wired it in the amp different, but the cathode switch - as drawn in the schem - is w/o any effect! The cathode bypass caps of the EL84 in series w/ each a 100K to ground don't influence anything. The R's shouldt be directly in series w/ the caps to ground, for anti pop purpose, when the...

That's what I got:

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Larry

Here still another, more detailled take of the rheo in the amp:

[img:800:533]http://www.larry-amplification.de/briti ... pur091.jpg[/img]

Larry

Ok, heres what i found. with 3k verses the original 1k per tube, the tone changed in the following ways. PROS: smoother top, more compress top. CONS: loss of volume, loss of highs This matches my experiences, as years ago I've tried a huge rheostat in front of the independent screen grid resistors ...

[img:399:126]http://i24.photobucket.com/albums/c39/dazco/screen.jpg[/img] iknowjohnny, if we are talking about voltage drop, you know V=IxR, so if you double the current flow the voltage drop is doubled, same as doubling the resistance with a single screen. So 1k is like 2k on each, plus 1k you alr...

mat wrote:How about of the reverb circuit, what is going with the V3 + V4a ?

The Reverb circuit is a standard Fender design as seen in most of the BF & SF Fenders, therefore I've drafted it as a block.

Larry

I've attached my pencil drafted schem once again. Unfortunately I haven't had enough time yet, to draft it w/ ExpressSCH, but hope, that this is of some help so far.

Larry

Bashing is bad form but I didn't see any bashing...just people giving their opinions. And if an opinion isn't positive that doesn't make it bashing. I also haven't seen in the entire thread, that anybody has been bashed - and opinions are free and shouldn't be constricted, no matter, whether positi...

I use them on all my builds to help protect the OTs. Larry mentioned that he uses a different diode with a higher reverse voltage on his Marshall-style builds so he can get away with a single diode, but I can't remember what type it was. BY509 - as small as a 1/4W resistor and good against spikes u...

keithrick wrote:For example, the cut control on my Rocket is fine but it can get dark really quick!

I've also noticed, that a .0047 cap makes an amp unuseful dark with the control on zero, hence I'd recommend a .0022 cap in seies to the pot.

Larry

Yes, the schem concerning the Contour is correct and is, what I've said.
In the Two Rock the 'usual Presence' is permanently dimed internal, the 390 ohms bypassed with the 1µF cap.

Larry