Quote from: ilyaa on July 03, 2014, 04:49:28 PMShould be fine, preamp supply voltage will probably come up a little.
if i just pull v4 out and play without a tube in that socket, will the amp be mad?
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Show posts MenuQuote from: ilyaa on July 03, 2014, 04:49:28 PMShould be fine, preamp supply voltage will probably come up a little.
if i just pull v4 out and play without a tube in that socket, will the amp be mad?
Quote from: ilyaa on July 03, 2014, 03:19:45 PMOk, got the correct drawing now, sorry about that!QuoteWhere are you getting those "should be" voltages from? Are you using a different schematic than the one from your first post?
its a classic A, not a classic B, i discovered
the new schematic is attached above (in my post that starts with NOTE:)
Quote from: ilyaa on July 02, 2014, 11:33:38 AMWhere are you getting those "should be" voltages from? Are you using a different schematic than the one from your first post?
on the power supply end of the 82K 1W resistor, the voltage looks high (should be 460 and its at about 490), but on the PI end, its low (should be 300 and its only 260). the collectors of the PI transistors are a bit low at 130-140V, instead of 150.
Quote from: BrianS on June 29, 2014, 01:08:42 PMI think you mean the PT secondary? So when it's connected to the board it reads 3.4VAC, but when disconnected it reads 29VAC?
I got to thinking a little bit and decided to disconnect the primary wires of the PT from the amp and measure that way. Doing this, I get 29vac.
Quote from: Roly on May 20, 2014, 02:30:39 PMYes, that is the same drawing I have. It's a 470 ohm (R88), not 47.
Quite likely not;
Title: GFX120a
No: 07S252-XX
Sheet: 1 of 2
Date: 6/19/98
The basic point is that one has extra bypassing the other doesn't, and this change in DSP supply arrangement may be a clue they were having some problems in this area.
Quote from: smackoj on May 13, 2014, 07:31:29 PMFirst, the inputs are labelled different than what we normally see, HI means for high output pickup, so there is less gain with the HI inputs. The LO inputs will give more gain.
Ola amigos; I have a Lab Series L7 which I am pretty sure is the same amp with 4 ten inch spkrs instead of 2 twelves. I can only get normal volume using one low gain input.
Quote from: Brhibler1 on May 13, 2014, 05:11:08 PMlol, that post was supposed to have gone here: http://www.ssguitar.com/index.php?topic=3472.msg25990#msg25990Quote from: g1 on May 13, 2014, 03:56:55 PM
Put a patch cord between preamp out and power amp in (dry), any difference?
That had already been checked. I'm an experience amp tech,