[Boatanchors] are all 6550's created equal?

[Bob Sullivan]

Jim is right about the height issue. There is at least one brand that will 
NOT fit under the cover! (I can't remember which, unfortunately). Stick 
with TungSol (originally used by CE), GE or RCA. Avoid imports. All tubes 
are not necessarily equal. US made NOS 6550's are easy to find.

73, Bob
WØYVA
Personal site: http://www.isquare.com/personal_pages/ras-hardware.htm


At 12:03 PM 8/2/2005, Jim DiMauro wrote:
>Eugene:
>
>FWIW, I'm using a pair of Svetlana SV6650s in my 100V,
>and they work like a charm (I don't know if you can
>get them anymore).  I can't speak to the Tung-Sol
>"reissue" tubes on eBay, but I can say that spending
>big bux for NOS Tung-Sols would be a waste, IMO.  As
>with anything else, the real issue is with the quality
>of the particular tube manufacturer.  A 6550 should be
>a 6550 no matter who makes it, but we all know that's
>not always the case.  When in doubt, go with a
>personal referral if you can get one (there's a
>Central Electronics mailing list on qth.net; you might
>go there for more information, opinions and
>referrals).  OTOH, you can try 6550s made by various
>manufacturers and find a good pair, probably for less
>than if you bought a pair of "real" Tung-Sols (leave
>the "real" Tung-Sols for the audiophools).  Anyway, if
>it were me, I'd try the Russian tubes. BTW, I heard
>somewhere that you have to be careful of the tube
>envelope size (height) in the 100V, to be sure that
>the tubes will clear the cage cover.  I'm not sure if
>that's true, it's just a recollection rattling around
>in the back of my brain along with a bunch of other
>junk.
>
>73,
>Jim
>w2bvm
>
>--- Eugene Hertz <ehertz at tcaf.org> wrote:
>
> >
> > Hi All, I *might* be in need of a pair of 6550's and
> > I was looking around. Seems that these were very
> > popular with audiophiles.  I was wondering if I
> > bought a pair that were advertised from an
> > audio-related company if they are the same and would
> > work for me (ce 100v).  For example, here is a pair
> > on the eplace that seem reasonably priced...
> > thoughts? epay item# 7340864412
> >
> > If they are not the same, how could I tell when a
> > 6550 is usable for audio or RF?
> > thanks
> > Eugene
> >
> >
> >
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