[Hallicrafters] SX-25 and Substitute for 6F6-G

[Jordan]

Try the 6K6... it should work fine.. 73 de Jordan...

Al Parker wrote:

> Hi Jon,
>     Substitution charts vary, some will only recommend direct subs only if
> all parameters are the same, or at least if the specs of the original one
> are less than the sub (e.g. plate or screen max. voltage).  For our
> applications, the first thing to look at is pin compatibility.  I've got one
> book that says the pinout of the 6F6 & 6V6 is different, but it isn't, for
> our general purposes, if you look at it.
>     1 of my bks says that the following may be subbed for a 6F6:   6DG6,
> 6K6, 6L6, 6U6, 6V6, 1611, 1621, 1622, 5881, EM84, EM840, KT63.   It won't
> necessarily work in all cases, and particularly in the opposite direction,
> but you're not likely to damage the circuit, and if only briefly, not the
> tube.  You'd soon have problems in many applications if you sub a 6V6 for a
> 6L6.
>     This is a generality, as many things can enter into particular tube
> circuit design & tube selection.  That's why we have so many different nrs,
> & many are substitutable.  But, go ahead and put in a pair of 6V6's in the
> place of your 6F6's, and you're not likely to notice any difference, nor
> will the radio.  I ckd the tube ratings, the 6V6 has higher plate & screen
> voltage than the 6F6, it can supply more output power, and has lower
> filament current.  (If you don't have a tube manual, you oughta find one).
> (to paraphrase warranty statements, "your observed results may vary")
> 73,
> Al, W8UT
> New Bern, NC
> BoatAnchors appreciated here
> http://www.thecompendium.net/radio/
> http://www.hammarlund.info
>
> ----- Original Message -----
> > I have a questions in regard to a viable substitute for a 6f6-G in a sx25.
> I was told that as long as
> > I replace both tubes in the audio output stage I could use a type 6V6.
> This
> > pleased me since I have several of those but no spare 6f6.  I looked at an
> > online tube database but it listed no such substitution.  In fact, it
> listed
> > that there was no substitution at all for a 6f6-g.  So, do I go with the
> 6v6
> > substitution, a different type, or just save the headache and buy a 6f6-g?
>
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