RE: Cathode Follower Output

Posted by Triode_Kingdom (A) on September 12, 2014 at 15:25:57

In Reply to: RE: Cathode Follower Output posted by Eli Duttman on September 12, 2014 at 14:40:41:

Yes, that's an internal bypass capacitor. It's intended to decouple the screen at UHF. If you scroll down the datasheet, total G2-K capacitance (including the bypass capacitor) is shown as 65pF. I think that's small enough not to cause problems. Incidentally, this tube isn't necessarily my first choice for this use, mainly due to the somewhat hefty filament requirements to run a pair. I just happen to have a number of NOS Mullard 829Bs that I'd like to use someday. There are other "alien/space" tubes that would look great sitting out in the open on top of a modern chassis. There's the 829B's little brother, the 832, and a few ST shapes with dual external anode caps.

The IT concept is appealing for several reasons, but I'm not thrilled by the additional cost. I think this can be accomplished as a low-power amplifier without the need to add another transformer. I did that in my larger SETs, and I'm happy with the results.

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Follow Ups Full Thread

Topic - Cathode Follower Output - Triode_Kingdom 10:50:12 09/12/14 (23)

RE: Cathode Follower Output - Stuben 12:12:49 09/18/14 (5)

RE: Cathode Follower Output - Al Noakes 06:10:21 09/19/14 (4)

RE: Cathode Follower Output - amnesiac 00:13:49 09/22/14 (0)

RE: Cathode Follower Output - Stuben 13:06:21 09/21/14 (2)

RE: Cathode Follower Output - Stuben 12:12:20 09/22/14 (0)

RE: Cathode Follower Output - Stuben 13:09:52 09/21/14 (0)

RE: Cathode Follower Output - Al Noakes 02:57:54 09/13/14 (5)

RE: Cathode Follower Output - Triode_Kingdom 10:38:04 09/13/14 (4)

RE: Cathode Follower Output - Al Noakes 05:07:03 09/15/14 (3)

RE: Cathode Follower Output - Triode_Kingdom 09:16:51 09/15/14 (2)

RE: Cathode Follower Output - Al Noakes 10:54:49 09/15/14 (1)

Got it - thanks! - Triode_Kingdom 13:13:22 09/15/14 (0)

RE: Cathode Follower Output - Kyle K 14:13:16 09/12/14 (0)

RE: Cathode Follower Output - danlaudionut 13:03:00 09/12/14 (5)

RE: Cathode Follower Output - Triode_Kingdom 13:14:06 09/12/14 (4)

RE: Cathode Follower Output - danlaudionut 14:05:28 09/12/14 (3)

RE: Cathode Follower Output - Triode_Kingdom 15:43:36 09/12/14 (2)

RE: Cathode Follower Output - danlaudionut 22:41:09 09/12/14 (1)

RE: Cathode Follower Output - Triode_Kingdom 11:25:32 09/13/14 (0)

RE: Cathode Follower Output - Eli Duttman 12:35:09 09/12/14 (3)

RE: Cathode Follower Output - Triode_Kingdom 13:34:39 09/12/14 (2)

RE: Cathode Follower Output - Eli Duttman 14:40:41 09/12/14 (1)

RE: Cathode Follower Output - Triode_Kingdom 15:25:57 09/12/14 (0)

Follow Ups

RE: Cathode Follower Output - Triode_Kingdom 15:25:57 09/12/14 (0)

RE: Cathode Follower Output

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