[ARC5] The 6U8 - what's the big deal with this "toob"

[Geoff]

The 6U8 had severe reliability problems which was somewhat mitigated by the 
hastily rushed 6U8A and then followed by the 6EA8.
I worked on a lot of equipment using the 6U8/6U8A in the 50-60's and can 
confirm its failure rates and often cantankerous operation as a triode 
oscillator or as a stable pentode mixer. The 6EA8 was a welcome replacement.

The 6GH8 was another disaster thankfully replaced with the 6GH8A and 
subsequent improvements.





----- Original Message ----- 
From: "Leslie Smith" <vk2bcu at operamail.com>
To: "ARC-5 List" <arc5 at mailman.qth.net>
Sent: Wednesday, December 05, 2012 4:25 PM
Subject: [ARC5] The 6U8 - what's the big deal with this "toob"


> Hello List,
> I would like to understand the question about 6U8's, in "Collins" mind.
> Why is the 6U8 considered to be a "hateful toob".
>
> 73 to you all
>
>
>  Les
>  vk2bcu at operamail.com
>
>
>> > You *think* it is good.  I understand that the no-filament rectifiers
>> > are hated by car radio folks MORE than the 6U8 is hated by Collins 
>> > guys.
>> >
>> > Smash it and put some 1N4007's in the base.
>> >
>> > Roy
>> >
>
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