RE: KT77s...

Posted by unclestu (D) on February 19, 2014 at 13:24:41

In Reply to: RE: KT77s... posted by Steve O on February 16, 2014 at 16:29:47:

That's not what Morrison told me: Metal fingers were the cheapest way to make a centering system.

Later RCA 7027 used a mica centering mechanims, So did other premium 6L6's including EL37's and 5881's. Most of my 807's including the milspec 5932 uses mica as the centering device.

As for the Bendix, theirs is a metal spring tensioner, very much more complex than the simple fingers used by most others. In tandem with their extremely thick ceramic spacing element in lieu of the mica, it was much more expensive to produce and probably exerts a lot more centering spring action.

The role of the mica sheets are often overlooked, by consumers. Take a careful look at most JAN tubes: the common 5751 and 5814's are good examples. The mica sheets are much thicker than in the typical consumer
grade tubes, sometimes triple the thickness. These are obviously done for a reason.

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Follow Ups Full Thread

Topic - Mushy rolled-off Mullards??? Not in my system! - ElWoodrow 13:03:30 02/15/14 (21)

RE: Mushy rolled-off Mullards??? Not in my system! - Michael Samra 18:15:25 02/15/14 (0)

Agreed - dividebytube 16:51:39 02/15/14 (2)

RE: Agreed - Michael Samra 18:19:10 02/15/14 (1)

RE: Agreed - dividebytube 06:44:28 02/17/14 (0)

If you're referring to NOS XF1/XF2... - Steve O 15:11:29 02/15/14 (16)

RE: If you're referring to NOS XF1/XF2... - Michael Samra 18:54:48 02/15/14 (8)

RE: If you're referring to NOS XF1/XF2... - soundchaserkt66 06:59:09 02/16/14 (1)

RE: If you're referring to NOS XF1/XF2... - Michael Samra 15:28:58 02/16/14 (0)

KT77s... - Steve O 19:41:53 02/15/14 (5)

RE: KT77s... - Michael Samra 22:31:59 02/15/14 (4)

RE: KT77s... - unclestu 13:12:06 02/16/14 (3)

RE: KT77s... - Steve O 16:29:47 02/16/14 (2)

RE: KT77s... - unclestu 02/19/1413:24:41 02/19/14 (0)

Good to know. - jusbe 23:48:33 02/16/14 (0)

RE: If you're referring to NOS XF1/XF2... - SETdude 15:56:08 02/15/14 (6)

That is the biggest problem - FenderLover 17:51:40 02/15/14 (1)

RE: That is the biggest problem - JNS 19:08:45 02/17/14 (0)

RE: If you're referring to NOS XF1/XF2... - ElWoodrow 16:33:52 02/15/14 (3)

RE: If you're referring to NOS XF1/XF2... - Michael Samra 19:06:22 02/15/14 (2)

RE: If you're referring to NOS XF1/XF2... - SETdude 04:49:43 02/16/14 (1)

RE: If you're referring to NOS XF1/XF2... - Michael Samra 05:28:44 02/16/14 (0)

Follow Ups

RE: KT77s... - unclestu 02/19/1413:24:41 02/19/14 (0)

RE: KT77s...

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