[Boatanchors] 250 TH and 250 TL

[James M. Walker]

It does if you reset to the proper voltages.
My BC-610(I) has a separate variac control
directly to the HV transformer, then you remove
the back cover and readjust the bias to the 250TL
then fire it up and test it, they do indeed work in the BC-610.
No Myth, No Magic, just the spec sheets and the tubes.
Jim
WB2FCN

----- Original Message -----
From: <WA5CAB at cs.com>
To: <boatanchors at mailman.qth.net>
Sent: Tuesday, March 28, 2006 11:29 AM
Subject: Re: [Boatanchors] 250 TH and 250 TL


> 250TH is high-mu, 250TL low-mu.  I didn't bother to look up the details
but
> the TL will require different drive and bias levels from the TH.  Sorta
like
> the difference between a 12AX7 and a 12AU7, but at a much higher power
level.
> Short answer is that the 250TL won't work properly in a BC-610..
>
> In a message dated 3/28/2006 9:59:06 AM Central Standard Time,
> hankarn at pacbell.net writes:
> > John,
> > All of the BC-610's I have owned and operated had 250TH's and 100TH's
> > never have seen a 250TL installed. Is it a drop in replacement?
> > Hank
> > KN6DI/5
>
> Robert Downs - Houston
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