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Old 26th January 2013, 06:32 PM   #1411
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DCb1 is no slouch by any measure. It is my SS volume control. If you dont need the gain, try the CF. It will be next for me. I will have both versions interchangable, depedning on my mood.
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Old 26th January 2013, 06:35 PM   #1412
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CF?
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Old 26th January 2013, 06:40 PM   #1413
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cathode follower. It is on first page. Would be good alternative to DCB1 if no gain is needed. Check first page.
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Old 26th January 2013, 07:43 PM   #1414
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Thank you.

I know it is a good contender... that is why I am following.... It will happen soon
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Old 26th January 2013, 09:23 PM   #1415
Salas is offline Salas  Greece
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It pushed the B&W MPA 1 monoblocks I repaired very easily in CF mode today. Those are 30dB gain amps nonetheless. And I liked live voices on the radio too.
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Old 26th January 2013, 10:01 PM   #1416
stajo is offline stajo  Sweden
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Nice Salas. I had kids here today so it was more Minecrafting then soldering but I made those:
Click the image to open in full size.
The hawkeyed can see that it has the same screwhole placement as SSHV2, so I can interchange them. The cap-thingy will become an R-C then.

I also did some quick voltage measurement and I ended up between 245 and 310 V B+ with 2,2-6,6 k as last R. That puts the bias to between 16,6 to 21 V which might put me in a strange little corner on the curves. Maybe a 680 DCR LL1660 would be more suitable.

Then I'm stuck with a strange groundnoice. I rewired stargrounding without results. DC-filaments and more smoothing C dont affect it.

Well, one's got to save some for the day after...

Staffan
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Old 26th January 2013, 10:13 PM   #1417
Salas is offline Salas  Greece
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Is there a possibility something oscillates there? What does the scope show?
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Old 26th January 2013, 10:21 PM   #1418
stajo is offline stajo  Sweden
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Quote:
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Is there a possibility something oscillates there? What does the scope show?
Thats possible. Usually that takes us to motorboating but i can easily swap the filterchoke to a resistor and see if it there. I could also rig the scope. Its downhill skiing on the agenda tomorrow so lets see what it brings.

I changed last RC and also second C a couple of times so it shouldnt be there . And its overkill 1 k carbons on the grids. But you never know with chokes and capacitors.
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Old 26th January 2013, 10:32 PM   #1419
Salas is offline Salas  Greece
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Can be some nuisance in the cathode circuit interfacing with the iron beasts.
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Old 26th January 2013, 10:39 PM   #1420
stajo is offline stajo  Sweden
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Can be some nuisance in the cathode circuit interfacing with the iron beasts.
Well yes. I could check with a lil resistor network instead of beasts.

Cathode Circuit is currently just the chokes (930 DCR 100+ H), 10 uF output caps decoupled with 10 k to ground.
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