nickm57 wrote:One question about the snubber values, they are rely low. Raw sounding amp? similar to no snubbers?
Yes I was thinking the same. These are really low snubbers, on the other hand; the resistor after coupling cap v2b is 180k so that should smooth things a bit. Edit: is 150k mmm...Edit again it is 180k
Last edited by erwin_ve on Thu Nov 11, 2010 8:32 am, edited 1 time in total.
Not raw at all. The 250K OD pots take care of that, combined with the EL34 tubes. 250K pots add a considerable amount of miller effect.
erwin_ve wrote:
nickm57 wrote:One question about the snubber values, they are rely low. Raw sounding amp? similar to no snubbers?
Yes I was thinking the same. These are really low snubbers, on the other hand; the resistor after coupling cap v2b is 180k so that should smooth things a bit. Edit: is 150k mmm...
dogears wrote:Not raw at all. The 250K OD pots take care of that, combined with the EL34 tubes. 250K pots add a considerable amount of miller effect.
erwin_ve wrote:
nickm57 wrote:One question about the snubber values, they are rely low. Raw sounding amp? similar to no snubbers?
Yes I was thinking the same. These are really low snubbers, on the other hand; the resistor after coupling cap v2b is 180k so that should smooth things a bit. Edit: is 150k mmm...
Thanks Scott, that explains a lot! So a different load regulates the Miller effect?
ampdork wrote:The original had some such sideways thing going on.
I'd suggest mounting them standing up like the others in the ps.
I have the one leaked gut shot, but it doesn't show if the originals had radial leads, snap in or screw terminals. Anyway, it doesn't really matter since I don't care if the amp looks different than the original.
Orienting the caps standing up probably would be a cleaner & stronger way to mount them since you wouldn't need to rely on silicone as the primary means to secure them. There is enough room on a typical PPS board that it could be modified to work. I would think drilling (4) 1/8" eyelets and running jumpers under the board is the best option without producing a custom PCB. You would want to keep the caps diameter around 30MM and watch how tall it is depending the height of standoff used.
talbany wrote:
Shout out any errors you see..Enjoy!!
Tony
Leads from bass and mid caps should be reversed. Presence cap is .1uf? Probably should be 1uf as per usual. Also, I have never seen the Jazz/Rock switch wired that way (connection between treble side common and bass side lower pole).. doesn't mean it's not right, just thought I'd mention it.
Tom/ Chris
THX REV 4 up..Chris on the R/J.. I thought so too.. AFAIK the RJ switch is correct..If you want to trace it back figure out how it functions differently than that of the standard that would be great.. If you do this and find any errors I'll be glad to change the layout..THX
Tony
" The psychics on my bench is the same as Dumble'"
Tony, first of all, thank you for all your hard work.
I know how tedious these layouts can be and how much work they are.
I was wondering if there was a better way to show that PAB relay, to show the way the traces are laid out?
Maybe use the #124 type graphic so you can manipulate the traces.
I know that the leads are on the normally connected contacts but for others not familiar with the way the relays work it would help if you could see the traces.
This amp is different in that it has both 22M resistors on the relay board instead of one 22M on the treble pot like #124.
Structo wrote:Tony, first of all, thank you for all your hard work.
I know how tedious these layouts can be and how much work they are.
I was wondering if there was a better way to show that PAB relay, to show the way the traces are laid out?
Maybe use the #124 type graphic so you can manipulate the traces.
I know that the leads are on the normally connected contacts but for others not familiar with the way the relays work it would help if you could see the traces.
This amp is different in that it has both 22M resistors on the relay board instead of one 22M on the treble pot like #124.
Thanks!
Tom
Sure be glad to do that.
THX... Tony
" The psychics on my bench is the same as Dumble'"
Structo wrote:
I was wondering if there was a better way to show that PAB relay, to show the way the traces are laid out?
Maybe use the #124 type graphic so you can manipulate the traces.
I know that the leads are on the normally connected contacts but for others not familiar with the way the relays work it would help if you could see the traces.
Tony- Here are a couple of relay options with traces if it helps. You may need to play with the transparency on the green board option when printing or converting to a .jpg.
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