[Boatanchors] Fw: New question

[WA5CAB at cs.com]

Barrie,

According to the parts list in TM 11-826 (BC-610-E...I), the secondary of 
the interstage transformer between the 2A3's and the 100TH's is 2750 ohms 
C.T. 


In a message dated 4/11/2010 5:47:53 PM Central Daylight Time, 
barrie at centric.net writes: 
> >BARRIE, there are 500 ohm to p-p class B grids  tx around, that is what
> >you need, a 15 t0 20 watt would be ok, maybe a 10 watt would work
> >if you could restrict the low freq of the voice.
> >old jack
> 
> Well, Jack, I was hoping there was something like that still available.  
> But 
> I have not been able to find anything.  I'm sure that as recently as a few 
> 
> months ago Hammond had a transformer such as I need on their website, but 
> I 
> don't find it now.
> 
> I don't think there would be anything wrong with just using a hifi output 
> transformer.  All I need to know is the likely impedence of the grids of 
> the 
> 100THs.
> >
> >On Sun, 11 Apr 2010 14:43:10 -0600 "Barrie Smith" <barrie at centric.net>
> >writes:
> >>I'd like to thank everyone that helped with my "100 watt VFO"
> >>question.
> >>
> >>I have everything I need for the rig except the modulation driver
> >>transformer.
> >>
> >>I'd like to use an old Bogan tube-type amplifier for the speech amp.
> >>  It has outputs from 4 ohms to 600 ohms.  So, if I use that amp to
> >>drive a hi-fi output transformer "backwards", what would the output
> >>(normally input) impedence need to be to drive the grids of a pair
> >>of 100TH modulator tubes?  Also, what would the wattage need to be?
> 

Robert & Susan Downs - Houston
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MVPA 9480