Pentode Driver Comparison 6C6, EF37, 717A, etc.

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Posted by SomeJoe on February 13, 2009 at 16:45:13

Folks,

This post is prompted by the review of the Tube Audio Lab WE91 300B Monoblocks posted on the SET Asylum and the subsequent response by the builder who states that:

"It definitely has a very distinct sound (interesting and old), partially thanks to the pentode driver and 2:1 plate to screen grid suppressor voltage ratio.
...
If any of you are going to build a WE91A with the 6C6, I'd suggest extra caution be taken about the value of caps used for the screen grid (suppressor) of the 6C6. To get more refined bass, I'd recommend 2uF - 2.8uF oil caps. Anything outside this range or different material of caps will give you a slight upper midrage glare that nobody wants".

Thus my question: has anyone here compared the sound of different pentode drivers, i.e. 6C6 vs. EF37 vs. 717A, etc.

I am curious to learn from your experience,

Review Tube Audio Lab WE91 300B Monoblocks (Open in New Window)

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Topic - Pentode Driver Comparison 6C6, EF37, 717A, etc. - SomeJoe 16:45:13 02/13/09 (17)

there's many other good ones... - PakProtector 06:19:04 02/14/09 (0)

RE: Pentode Driver Comparison 6C6, EF37, 717A, etc. - rtsang 20:06:57 02/13/09 (15)

RE: Pentode Driver Comparison 6C6, EF37, 717A, etc. - SomeJoe 05:12:26 02/14/09 (0)

RE: Pentode Driver Comparison 6C6, EF37, 717A, etc. - lovetube 02:59:04 02/14/09 (13)

RE: Pentode Driver Comparison 6C6, EF37, 717A, etc. - RC Daniel 15:44:52 02/14/09 (3)

RE: Pentode Driver Comparison 6C6, EF37, 717A, etc. - lovetube 18:39:31 02/14/09 (2)

RE: Pentode Driver Comparison 6C6, EF37, 717A, etc. - RC Daniel 14:25:07 02/15/09 (1)

CV1043/VR53/EF39 - coresta 14:12:18 02/16/09 (0)

RE: Pentode Driver Comparison 6C6, EF37, 717A, etc. - rtsang 05:13:32 02/14/09 (8)

me too . here is the red colour that I like about the EF37a - lovetube 18:44:00 02/14/09 (0)

RE: Pentode Driver Comparison 6C6, EF37, 717A, etc. - lovetube 05:35:49 02/14/09 (6)

Plate voltage and plate resistor - rtsang 08:31:45 02/14/09 (0)

Pentode lover - rtsang 05:47:04 02/14/09 (4)

RE: Pentode lover - lovetube 06:04:47 02/14/09 (3)

RE: Pentode lover - rtsang 07:28:34 02/14/09 (0)

Pete Millett 829 Amp - SomeJoe 06:29:55 02/14/09 (1)

Pete Millett E-Linear amp too - PakProtector 07:39:48 02/14/09 (0)

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