[Boatanchors] Commercial/kit transmitters using 1625's

[WF2U]

The Heathkit DX-100 (and also the B version) transmitter used a pair of
1625's as the modulator stage.
There was also a linear amplifier made by P&H, model LA-400 (including the
B, C and D versions) which used 4 1625's.

These are the first ones jumping into my mind. There may have been others as
well...

73, Meir WF2U
Landrum, SC



> -----Original Message-----
> From: boatanchors-bounces at mailman.qth.net
> [mailto:boatanchors-bounces at mailman.qth.net]On Behalf Of
> shoppa_boatanchors at trailing-edge.com
> Sent: Sunday, September 04, 2005 7:07 AM
> To: boatanchors at mailman.qth.net
> Subject: [Boatanchors] Commercial/kit transmitters using 1625's
>
>
> The ARRL handbooks for many many years had the transmitter using a
> single 1625, and a lot of 50's and 60's and even a few 70's QST
> artciles showed paralleled/push-pulled 1625's (one even had 8 of
> them!) in use in transmitters and modulators.
>
> Even today it's obvious that there were a lot of surplus 1625's
> out there for many years.  And of course ARC-5's used them too.
>
> Did any non-mil-surplus rigs, other than homebrew ones, use
> 1625's from the factory?  How hard was it to sub a 1625 for a
> 807?  Gotta change the tube base, filament transformer, anything
> else?  It seems to me that the 1625 is a little bit taller than
> a 807.
>
> Tim.
>