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Old 1st January 2012, 08:17 PM   #241
Salas is offline Salas  Greece
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If you don't need the gain since you make do with a dcb1, choose #144 which is a follower that Scott Gregory makes. The gain circuit you posted is right too, but we use an active regulator for B+ since then for both common cathode or cathode follower. Either Maida, or SSHV shunt reg (smoother).
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Old 1st January 2012, 08:26 PM   #242
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I was gooing to try as a pre after wonderful DCB1 as volume control. Planned on using you regultors of course. May need current source on top for gain since it will be driving power buffer. Do you have proper incarnation of regulator forthis amp. I know you offered two. Happy new year.
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Old 1st January 2012, 08:44 PM   #243
Salas is offline Salas  Greece
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Gives 15dB gain with the resistor, if its enough to your speakers. Just a little more with CCS load for the additional work and devices. No real boost. Would need careful suspension and placement to avoid microphonics when in gain mode. Use straight profile 6V6 bottle. Look for SSHV2. I would make double mono regs set at 45mA each.
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Old 1st January 2012, 09:36 PM   #244
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15dB should be fine. I think current pre is about 10. thanks for the info.
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Old 1st January 2012, 09:59 PM   #245
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Use a grid stopper 220R-1K attached to the 6V6 control grid pin if you will use just DCB1 and interconnect instead of 6V6's own vol pot. Also 0.1-1Meg resistor from stopper's input end to ground.
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Old 1st January 2012, 10:21 PM   #246
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One is grid stopper and other input shunt?
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Old 1st January 2012, 10:37 PM   #247
Salas is offline Salas  Greece
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Like this one from #190
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File Type: gif Salas6V6GTlinePreamp.gif (15.9 KB, 534 views)
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Old 1st January 2012, 11:33 PM   #248
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Quote:
Originally Posted by Salas View Post
Was it a pro sound compressor machine?
yes, this and many versions over the years, AM864 was one of the first vari-mu as this one is modeled off of. Manley vari-mu is simular. The La-2a was based off of this design. The detection circuit was modified to drive the tb4 module instead of backing off the bias of the first stage.

90% of my circuits I build go into the music world

Last edited by DavesNotHere; 1st January 2012 at 11:37 PM.
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Old 1st January 2012, 11:59 PM   #249
Salas is offline Salas  Greece
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Good stuff. I prefer Manley VoxBox to Avalon mic pre BTW.
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Old 2nd January 2012, 09:28 AM   #250
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Salas, being new to tubes, i realized that tubes need heaters, i think. What kind of filament supply do you use on this thing.
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