[Boatanchors] Hii FI amp as speech amp

[Carl]

500-600 Ohms are interchangable. One industry used one and another the 
other, dont 'member which.

If you get audio out of the 614 Id suspect an open 100TH driver xfmr or 
related to that area.

BUT:
Have you checked voltages and the rest of the circuitry that switches 
the modulator into the B+ to the 250TH?

Its been decades since I worked on a 610.

Carl
KM1H

----- Original Message ----- 
From: "Barrie Smith" <barrie at centric.net>
To: "Carl" <km1h at jeremy.mv.com>; "Boatanchors Mail List" 
<boatanchors at mailman.qth.net>
Sent: Sunday, November 02, 2008 8:57 PM
Subject: Re: [Boatanchors] Hii FI amp as speech amp


>
> ----- Original Message ----- 
> From: "Carl" <km1h at jeremy.mv.com>
> To: "Barrie Smith" <barrie at centric.net>; "Boatanchors Mail List" 
> <boatanchors at mailman.qth.net>
> Sent: Sunday, November 02, 2008 6:04 PM
> Subject: Re: [Boatanchors] Hii FI amp as speech amp
>
>
>>I use a PP 6L6 Bogen PA amp to drive PP-250TH modulators Barrie. It 
>>came with a 600 Ohm output which was perfect to drive the input xfmr 
>>on the modulator deck which is in the rack.
>>
>> Using a 600 Ohms between units is a standard going back to the 30's.
>>
>> If you dont have that available you can change the xfmr.
>>
>> Carl
>> KM1H
>
> Thanks, Carl.
>
> I have several amps around here, but nothing with 60 ohms out.  I even 
> looked at my Eico HF-81, but it only goes to 32 ohms.
>
> The manual for the HT-4B says that the input to the 2A3 grids is 500 
> ohms (?).
>
> The only reason I'm attemting to do this is that I can't get audio, or 
> modulation, from the BC-614E to the HT-4B, so I thought I'd try 
> putting some audio directly into the transmitter.
>
> Just want to get back on AM this winter!
>
> 73, Barrie, W7ALW
>>
>>
>> ----- Original Message ----- 
>> From: "Barrie Smith" <barrie at centric.net>
>> To: "Boatanchors Mail List" <boatanchors at mailman.qth.net>
>> Sent: Sunday, November 02, 2008 7:41 PM
>> Subject: [Boatanchors] Hii FI amp as speech amp
>>
>>
>> I know it's possible to use a Hi Fi amplifier to drive the modulation 
>> in the BC-610, but Googling for half a day has not yielded results.
>>
>> Any information on that subject greatly appreciated.
>>
>> 73, Barrie, W7ALW
>>
>>
>> --------------------------------------------------------------------------------
>>
>>
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>