[Boatanchors] 1/4 KW AM rig

[Carl]

You can sell 2A3's for far more than 6B4's. In the meantime just use triode 
connected 6L6's, metal are fine.

You can also use AB1 6L6's with NFB and get the same low distortion as 2A3's 
and lose the poor frequency response of the average ham level driver 
transformer.

Carl
KM1H


----- Original Message ----- 
From: "LARRY D GODEK" <telegrapher at q.com>
To: <boatanchors at mailman.qth.net>
Sent: Monday, April 25, 2011 3:13 PM
Subject: [Boatanchors] 1/4 KW AM rig


>
> Got it home yesterday and unlaoded into the garage for overhaul or.....
>
> Really nice rig, 4-250 final driven with a pair of 100th mod tubes and 
> those are driven by a pair of 6B4 types.  Rig has built in scope for 
> monitoring the output.  uses BC-610 type coils in a box at the top of the 
> rack for antenna loading if you use open wire.  Otherwise RF is routed out 
> to a coax line from the PA.  So it appears.
>
> No documentation which hurts but it's in such good shape and runs from a 
> 220 line voltage.  everything in there is well built and it doesn't appear 
> to suffer from "under" building.  Several different timers are 
> incorporated.  One deck is for the 6AG7-2E26 oscillator assy.  It also has 
> a couple fo VR150 regulator tubes along with 10 xtal sockets which are 
> switchable from the front panel.
>
> Bad part other than no documentation, both 6B4 tubes along with 3 6V6 
> types and the 6AG7 were flat.  Not a problem with the 6V6's but the 6AG7 
> and 6B4s are a different story.  I have 2A3's here but no 6B4 types.  Any 
> out there anyplace?  Other than E--- of course.
>
> Gonna get this thing fired up one of these days.  Got some old 
> electrolytic caps under a couple of the chassis's but other than that, 
> she's in excellent shape.  3B28's for rectifiers.
>
> I'm thinking that this layout sounds familiar.  It's probably post 50's 
> era.  Anyone recognize it?  Time to dig thru the old handbooks to see what 
> i can find out.
>
> Larry
> W0OGH
>
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