[ARC5] BC-375 tubes

[Dennis Monticelli]

I guess the accumulated air molecules are not captured well by the
gettering action of a HV tube, which relies on a hot anode vs the flash of
very active metals like one finds in lower power tubes.

Dennis AE6C




On Wed, Nov 20, 2013 at 9:09 AM, Geoff <geoffrey at jeremy.mv.com> wrote:

>  I dont know of any way to cure an air leak short of pumping down the
> vacuum.
> A gas leak as I describe it is released from the anode thru lack of use
> and can often be regettered by running the anode at color. That gas is blue.
>
> Carl
>
>
>
>
> ----- Original Message -----
> *From:* Dennis Monticelli <dennis.monticelli at gmail.com>
> *To:* Geoff <geoffrey at jeremy.mv.com>
> *Cc:* Mike Everette <radiocompass at yahoo.com> ; ARC-5 Maillist<arc5 at mailman.qth.net>
> *Sent:* Wednesday, November 20, 2013 11:27 AM
> *Subject:* Re: [ARC5] BC-375 tubes
>
> I wonder how many of those leaky 826's would be OK after an extended
> "bake?"  A very slow leak can add up to a lot over 60 years, but if
> successfully gettered they may be OK for our immediate use and for the next
> decade.
>
> Dennis AE6C
>
>
>
>
>
>
> On Wed, Nov 20, 2013 at 8:08 AM, Geoff <geoffrey at jeremy.mv.com> wrote:
>
>>
>> ----- Original Message ----- From: "Mike Everette" <
>> radiocompass at yahoo.com>
>> To: <arc5 at mailman.qth.net>
>> Sent: Wednesday, November 20, 2013 7:35 AM
>> Subject: [ARC5] BC-375 tubes
>>
>>
>>
>> I haven't read every message in the thread so don't know if this has been
>> tried yet.
>>
>> What about the 826? This is a triode, looks like an 829B without the
>> plate pins.
>>
>>
>> The only ham use of these things seems to have been in Gonset 6 and 2
>> meter linears to be paired with the Gooney Box AM rigs. Thanks to the
>> cold-war generousity of th' Fed'rul Goobermint and the Civil Defense
>> program, there are about a bazillion of these tubes still extant, NIB.
>>
>> And I don't think th' Audiophools have discovered them yet.
>>
>> 73
>> Mike
>> W4DSE
>>
>>
>> ** Unfortunately many 826's have seal leaks. I went thru several dozen
>> and found only 9 good ones not too long ago. Some audiophools have
>> discovered them, maybe that nice purple glow gives warm fuzzy music.
>>
>> Carl
>>
>>
>>
>>
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