RE: read what Pimm says

Posted by Eli Duttman (A) on February 22, 2015 at 15:08:37

In Reply to: read what Pimm says posted by GSH on February 22, 2015 at 13:11:04:

Ah hah! It's not "simple" CCS loading, which is known to be problematic.

If you want to adapt Gary's approach to a small signal pentode, consider the 6AC7. The EF86 and 6SJ7 run at low plate currents, which might be difficult to get right.

You said the mono tuner has an O/P of 0.1 V. There are pretty darned simple ways of getting the 20X or so gain needed. Gary's CCS setup, with a μ follwer O/P, loading a 6J5 is but 1 possible way.

Are you interested in trying Mr. Pimm's scheme, for its own sake?

Eli D.

6AC7 Data Sheet (Open in New Window)

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Follow Ups Full Thread

Topic - CCS set up for 1620 or 6SJ7 - GSH 10:33:41 02/21/15 (18)

RE: CCS set up for 1620 or 6SJ7 - Tre' 11:24:52 02/21/15 (17)

RE: CCS set up for 1620 or 6SJ7 - GSH 14:10:58 02/21/15 (16)

RE: CCS set up for 1620 or 6SJ7 - Eli Duttman 15:53:57 02/21/15 (14)

RE: CCS set up for 1620 or 6SJ7 - GSH 08:31:05 02/22/15 (13)

RE: CCS set up for 1620 or 6SJ7 - Caucasian Blackplate 19:12:23 02/22/15 (0)

read what Pimm says - GSH 13:11:04 02/22/15 (2)

RE: read what Pimm says - Eli Duttman 15:08:37 02/22/15 (1)

RE: read what Pimm says - GSH 15:16:45 02/22/15 (0)

RE: CCS set up for 1620 or 6SJ7 - Eli Duttman 08:38:04 02/22/15 (8)

RE: CCS set up for 1620 or 6SJ7 - Tre' 08:48:12 02/22/15 (7)

RE: CCS set up for 1620 or 6SJ7 - JKT 12:09:54 02/22/15 (6)

Re: Schematics shown by GSH above... - Lew 08:37:22 02/23/15 (0)

Norton equivalent - Tre' 21:12:51 02/22/15 (0)

Excellent - drlowmu 20:02:08 02/22/15 (2)

RE: Excellent - JKT 22:54:59 02/22/15 (1)

RE: Excellent , Norton Ave, LA, CA, is "C.J." ...still with us?? - drlowmu 07:08:46 02/23/15 (0)

Nice explanation. Thanks (nt) - Tre' 15:56:17 02/22/15 (0)

RE: CCS set up for 1620 or 6SJ7 - Triode_Kingdom 15:48:25 02/21/15 (0)

Follow Ups

RE: read what Pimm says - Eli Duttman 15:08:37 02/22/15 (1)

RE: read what Pimm says - GSH 15:16:45 02/22/15 (0)

RE: read what Pimm says

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