RE: 8417 tubes and their history.

Posted by Jim McShane (D) on August 10, 2016 at 07:40:14

In Reply to: 8417 tubes and their history. posted by Michael Samra on August 9, 2016 at 21:30:03:

Apparently 8417 tubes were quite difficult to make as well. In fact some say the only good 8417 is a Sylvania, the GEs had some grid issues IIRC. The very high Gm of the 8417 (about 50% higher than a 6550) meant internal construction had to be very high precision due to the close spacing of the elements. Apparently that was quite difficult to do even back then.

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Follow Ups Full Thread

Topic - 8417 tubes and their history. - Michael Samra 21:30:03 08/09/16 (10)

RE: 8417 tubes and their history. - Alpha Al 19:54:06 08/11/16 (0)

RE: 8417 tubes and their history. - hahax@verizon.net 18:45:40 08/10/16 (0)

RE: 8417 tubes and their history. - Jim McShane 07:40:14 08/10/16 (2)

It kind of puts you in mind of the later EI KT90 type 3 and later tubes - Michael Samra 20:25:51 08/10/16 (0)

RE: 8417 tubes and their history. - caffeinator 12:52:28 08/10/16 (0)

RE: 8417 tubes and their history. - garymuffley 07:05:33 08/10/16 (0)

IMO&E the 8417 amps Quaicksilver made with two GZ34s and an LCLCLC PSU were - Timbo in Oz 02:28:07 08/10/16 (3)

RE: IMO&E the 8417 amps Quaicksilver made with two GZ34s and an LCLCLC PSU were - garymuffley 08:49:25 08/10/16 (1)

It was a long time ago! :-) - Timbo in Oz 09:51:11 08/10/16 (0)

Yep, agree. Heard 'em with Vandy's at Audio Connection in Jersey. Natural timbre, clear & robust sound. nt - Rick W 07:33:38 08/10/16 (0)

Follow Ups

RE: 8417 tubes and their history. - Jim McShane 07:40:14 08/10/16 (2)

It kind of puts you in mind of the later EI KT90 type 3 and later tubes - Michael Samra 20:25:51 08/10/16 (0)

RE: 8417 tubes and their history. - caffeinator 12:52:28 08/10/16 (0)

RE: 8417 tubes and their history.

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