[BC] Old AM rigs...

[Robert Meuser]

Burt

That is part of the story. Your allusion is how to keep a tube TX performing 
NEARLY as well as a SS TX. The rest of the story is that with bounce, tilt and 
overshoot a tube TX can not modulate as deeply as an SS unit.  RECEIVERS can not 
handle the square waves modern TXs can transmit. The problem or effect is at the 
receive side. Any SS TX modulated at no more than 90% negative will wipe away a 
tube TX.

R

Burt I. Weiner wrote:
> When you claim that old tube transmitters sound nice because they're 
> warm and mellow, keep in mind that they could also sound good because 
> they were clean if they were well maintained.  KFAC had an old RCA 
> BTA-5F.  Long before NRSC came along we removed the "splatter Filter" in 
> the transmitter.  The modulation transformer was a replacement from a 
> BTA-10B and had a lot of iron.  I don't remember the exact figures on 
> response and distortion but it was something like+/- 2 dB  50 Hz to 13 
> kHz and under 2% distortion at 95% modulation.  This was back in 1968, 
> there-abouts. With good drive and the broadband nature of the antenna 
> system, 365 foot self supporting tower for ND along with a decent radio, 
> KFAC sounded really good.
> 
> Burt
> 
> 
> At 08:49 AM 6/3/2006, you wrote:
>> From: Rich Wood <richwood at pobox.com>
>> Subject: Re: [BC] bta-250m
>> To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
>> Message-ID: <7.0.1.0.2.20060603075537.04d5cec0 at yahoo.com>
>> Content-Type: text/plain; charset="us-ascii"; format=flowed
>>
>> ------ At 10:51 PM 6/2/2006, Bob Barnswatts wrote: -------
>>
>> >Over the years I have had several GMs get me aside as i
>> >consulted  at other stations and ask me "Hey, Bob, How come our NEW
>> >Transmitter doesn't sound as good as our old (plate modulated)
>> >transmitter did"....and I tell em cause its new and solid state it
>> >will never sound like the old ones.  Something about tubes on AM,
>> >sorry folks, but they have a sound that can't be done in transistor 
>> form.
>>
>> Does anyone make an AM receiver that would justify trying to
>> duplicate the sound of an old transmitter? Why not just buy a Ramsey
>> and a power amp?
>>
>> Rich
> 
> Burt I. Weiner Associates
> Broadcast Technical Services
> Glendale, California  U.S.A.
> biwa at earthlink.net
> K6OQK
> 
> 
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