[Amps] Matched set 8122's needed

[Carl]

They should be matched to within 1 volt of bias to obtain 100 ma each of 
idle current.

With a few extra parts you can have individual controls which will allow 
deltas to 5-6V to be used but at some loss in IMD at the extremes.

I have both my 6M version and a 160-10M HF version setup that way. Both 
started off as engineering prototypes which Ive had since 1964-65. Another 
near mint serialized one is mostly stock and used on the nintage SSB 
station.

Carl
KM1H
National Radio 1963-69
Member of NCL-2000 and NCX-1000 Design Teams



>I also have a NCL-2000 and I'm curious about the 'matching' issue.
> Are there modifications / methods to allow use of unmatched tubes?
> thanks and 73
> frank w0ecs
>
>
>
> On 4/5/2010 10:19 AM, Hsu wrote:
>> hi, I have some brand new 8122s, but I can not matched  pair, I haave no 
>> the equip what using this tube.
>>      Regards
>>          Hsu
>> ----- Original Message -----
>> From: "Michael Zeglen"<kl7ai at hotmail.com>
>> To:<amps at contesting.com>
>> Sent: Monday, April 05, 2010 9:40 PM
>> Subject: [Amps] Matched set 8122's needed
>>
>>
>>
>>> Does anyone have a "GOOD" matched set of 8122's laying around that they 
>>> will part with? Rebuild of my NCL-2000 underway. Please reply off 
>>> reflector to: kl7ai at hotmail.com
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