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@hotmail.com>
>> To:<amps@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@hotmail.com
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>
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