[Boatanchors] Fw: New question

[Barrie Smith]

> 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?
>>
>> Thanks & 73, Barrie, W7ALW
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