Re: Export Model..a brief history

[greenacres113-2]

In the 1960s Henry & others marketed amps  for other than amateur use. They were called ' export models'. For military, government civilian & other uses. Most would easily reach amateur limits for domestic use. The 'export models' usually had a heavier plate transformer. Some times a larger cooling chimney. The  same amperage but 500v or more  higher out. Using the same amp but with the export model  xfmr could result in 500 or a 1000 more watts output.A friend was stationed on Deigo Garcia in the Indian Ocean. The ham shack ran such an export model amp. They used it  for hamming & MARS work.  He said if he LIGHTLY drove this amp  it put out 3KW. Another friend bought a used amp  with the 'export model' label. He had to really drive it lightly. He set the HyGain balun on his TH6 on fire! Supposed to be a 5 KW balun. The bigger Alpha  had 3 holes cut in the chassis. USA  ones were sold with 2 tubes but I've heard guys say they were running a full 3 holer. You  fill in the blan
 k.
These companies need to sell to other markets besides amateur radio to stay in business.Henry amps used to be  used in hospitals for Diathermy.
k9il
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[greenacres113-2]

In the 1960s Henry & others marketed amps  for other than amateur use. They were called ' export models'. For military, government civilian & other uses. Most would easily reach amateur limits for domestic use. The 'export models' usually had a heavier plate transformer. Some times a larger cooling chimney. The  same amperage but 500v or more  higher out. Using the same amp but with the export model  xfmr could result in 500 or a 1000 more watts output.A friend was stationed on Deigo Garcia in the Indian Ocean. The ham shack ran such an export model amp. They used it  for hamming & MARS work.  He said if he LIGHTLY drove this amp  it put out 3KW. Another friend bought a used amp  with the 'export model' label. He had to really drive it lightly. He set the HyGain balun on his TH6 on fire! Supposed to be a 5 KW balun. The bigger Alpha  had 3 holes cut in the chassis. USA  ones were sold with 2 tubes but I've heard guys say they were running a full 3 holer. You  fill in the blan
 k.
These companies need to sell to other markets besides amateur radio to stay in business.Henry amps used to be  used in hospitals for Diathermy.
k9il
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[Bob Naumann W5OV]

Most of the so-called export model amplifiers were capable of well in
excess of double the legal limit in those days, and most could more than
double today's limit of 1500w.

The big Alpha 77 export models had two 8877 tubes in them - *not three*
along with a much bigger power supply. They could run about 3 to 4kW or so
output.

The smaller Alpha 76CA/PA and the 78 had three 8874 tubes in them. While
these could exceed legal limit output, they would be considered "normal"
by today's standards and only run about 1500 output or so.

Henry sold amps like the 8K and others that could well exceed the legal
limit too.

73,

Bob W5OV

> In the 1960s Henry & others marketed amps  for other than amateur use.
> They were called ' export models'. For military, government civilian &
> other uses. Most would easily reach amateur limits for domestic use. The
> 'export models' usually had a heavier plate transformer. Some times a
> larger cooling chimney. The  same amperage but 500v or more  higher out.
> Using the same amp but with the export model  xfmr could result in 500 or
> a 1000 more watts output.A friend was stationed on Deigo Garcia in the
> Indian Ocean. The ham shack ran such an export model amp. They used it
> for hamming & MARS work.  He said if he LIGHTLY drove this amp  it put out
> 3KW. Another friend bought a used amp  with the 'export model' label. He
> had to really drive it lightly. He set the HyGain balun on his TH6 on
> fire! Supposed to be a 5 KW balun. The bigger Alpha  had 3 holes cut in
> the chassis. USA  ones were sold with 2 tubes but I've heard guys say they
> were running a full 3 holer. You  fill in the blan
>  k.
> These companies need to sell to other markets besides amateur radio to
> stay in business.Henry amps used to be  used in hospitals for Diathermy.
> k9il
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

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