[Boatanchors] [Heathkit] Help w/ tubes

[Rich Post]

Hi Dave,

Have pondered this question myself for the three Heath high voltage reg 
supplies at my QTH.  The tubes in that relatively simple application are 
not all that critical if they can handle the current (50 mA each).

I am planning to try the 6DQ6.  It should easily handle the current and can 
certainly handle the voltage.  The main issue is the need for a plate cap 
in place of pin #3.  An adapter and an insulated top cap would be ideal if 
plug-compatibility is to be maintained.  Otherwise the only pin of concern 
is bringing the plate pin (3) out to the top cap.  All the other pins match 
the 6L6GC.

  The only drawback I can seen is the somewhat greater filament 
current.  The other subs that come to mind are the much-in-demand 
audiophile tubes with equally high prices.  The top-cap horizontal output 
tubes are mostly ignored by the audio crowd for good reasons but would seem 
to be OK inside a protective metal boxed device like the Heath reg power 
supplies.

If you can find metal 6L6 tubes, my Heath PS-4 uses those.  Audio buffs 
avoid those because they don't glow.

73 de Rich KB8TAD


At 06:44 PM 11/27/2009, Paul Baldock wrote:
>I think an EL34 will work
>
>- Paul
>
>
>
>At 12:38 PM 11/27/2009, Dave wrote:
> >I have two Heathkit SP-2717A HV power supplies and both need the
> >6L6GC tubes.  Anyone now where I can find atlease a pair for a
> >reasonable price?
> >
> >Or, prefereably, anyone know of a substitute I use in place of the 6L6's?
> >
> >Thanks,
> >
> >Dave
> >
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