[Boatanchors] 8122 Suitability/Selection (was: 6146 discussion on )

[D C *Mac* Macdonald]

Hi, Jim (and others).

Might I ask how Burle 8122s can be correctly
chosen for use in the National NCL-2000 amp?

I have previously been advised that original
NOS RCAs are no longer available at decent cost.

* * * * * * * * * * *
* 73 - Mac, K2GKK/5 *
* (Since 30 Nov 53) *
* Oklahoma City, OK *
* USAF, Ret (61-81) *
* * * * * * * * * * *




From: james.liles at comcast.net
To: boatanchors at mailman.qth.net
Date: Wed, 6 Jul 2011 12:36:29 -0500
Subject: [Boatanchors] 6146 vs 6146A vs 6146B or 6146W

> SNIPPAGE <

The reason that I followed with interest is the history of the 8122 seems to 
draw a parallel. Some amplifiers will work with any 8122 and others will 
only work with about 3/4 of the production without modification, and others 
cannot be made to operate properly with nearly 1 in 6 8122's. There is a 
broad range of bias and neutralization attributes involved. Burle is the 
only manufacturer that classified them with a four color code to enable 
intelligent choice.

Kindest regards Jim K9AXN