Svt cl manual

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What I've written thus far is: All six power tubes feed a Diode OR circuit to feed the nominal cathode currents as discrete voltages to the Fault Detector buss, which is pre-biased from the 6. I think that sets a trip threshold of 4. I haven't lately opened up one of the rental SVT-CL's to get empirical voltage readings to confirm this On the schematic, there are six lines from each cathode of the power tubes, coming down from the ribbon cable from the power tube PCB , where power tube V1 cathode is on line 5, V2 cathode is on line 1, V3 cathode is on line 3, V4 cathode is on line 11, V5 cathode is on line 9, and V6 cathode is on line 7.

That's where I calculate 4. The Fault Detector buss, fed from each power tube cathode thru a 2. There is an attenuated half-wave rectified 6. That's where I calculated a peak value of around 2.

Does this second paragraph make sense that I composed above? Last edited by nevetslab ; , AM. I had previously checked the readings of the Cathode resistors and screen resistors. The cathode resistors ranged from Similar readings for the ohm screen resistors. I'll have to call Antique to see what else they have I've previously read the currents of a set having such an imbalance, and under load, there's also similar imbalance in the current sharing of the triad of tubes under drive conditions.

Each tube's label has those to numbers, along with a seven-digit ID and a four-digit alphanumeric code, so there's info in the database associated with the Alpha Tube Matching system they use. Attached Files. Last edited by nevetslab ; , AM. Yeah, the sextets really suck for trying to get six that all work and are tight match. I did like the Eden ET that I had that had individual bias pot for each of the power tubes. I did measure bias currents with the tubes I have and found a much wider range than I expected.

There were enough that were close that I put them together in one of the triples and when I turned up the bias it went from no LED to green LED only, so I think the tube mismatch is the only problem, and now that I know better how the bias monitoring works it makes sense. Thanks again for the help. As time goes on, I often find one tube having gone bad, like I just found on this amp I'm working on.

I was completely out of Sovtek's in transconductance range, so had to order a new Sextet, and end up with five more 's to live in the support tubes to hopefully keep some other amps alive and working that need Sovtek's in that range. I juggle tubes on a regular basis, using that set-up shown in the photos. Originally posted by nevetslab View Post. If you're not finding any of the six power tubes passing more than I don't think I've ever had to replace anything in those circuits other than one or more of the IC's.

Of course that area just happens to be on the main board, with no easy access from the component side of the board when it's powered up. Somewhat easy to navigate from the foil side, though still a PITA. Keep us posted, as you may be in uncharted waters for all of us to learn from. Girls Out West Busty lesbians masturbate?????? All rights reserved. Yes No. OK Cancel.