[R-390] Which Ballasubstitution? You decide.

[Barry Hauser]

Just beware of the antiballasubstitutionists -- radical new age splinter
group of the Spanish Inquisition ...

Anon

----- Original Message ----- 
From: "Drew Papanek" <drewmaster813 at hotmail.com>
To: <r-390 at mailman.qth.net>
Sent: Wednesday, January 05, 2005 6:48 PM
Subject: [R-390] Which Ballasubstitution? You decide.


> Hello All,
>
> On the subject of ballasubstitutions a question was raised by Kenneth.
>
> He inquired as to which of two methods is the better. Each has advantages
> and disadvantages:
>
> 1. 12BH7 modification: same heat production as 3TF7, needs another tube,
> keeps the stock 6BA6's,
>      looks reasonably authentic.   12BH7, 12BY7, 12BV7  can be used and
can
> have gas, shorts,
>      and/or no emission so long as the heater is good.  Using a defective
> tube as a power resistor
>      gives you a sense of accomplishment; that you got something for
> nothing.
>
> 2. Two 12BA6 and a paperclip: about 3.8 watts less heat on the IF deck,
> needs other tubes, big empty
>     socket.  12BA6 are easy to find.  I did not use the traditional
> paperclip to jumper the ballasocket;
>     instead I  wrapped a fine wire around the two correct pins on the
> defunct 3TF7 and plugged it back
>     into the socket.  Except for missing the very faint glow of the 3TF7
now
> gone dark, looks original.
>
> Make your choice (Remember also many other substitution schemes).
>
> Drew
>
>
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