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Subject: [AMPS] ACOM Amps
From: (2)
Date: Mon, 2 Jul 2001 09:04:46 -0700
>I don't think so. My ACOM 2000A has been quite solid in the autotune
>department. I had a couple of problems initially -- a bad Kilovac vaccum
>relay (gone when I replaced it with a Jennings) 

/\  ¿Does the vacuum relay operate from a speedup circuit using a coil PS 
of 3 - 5 x the rated coil V, current limited by a series-R.?

>and a bad 4CX800 (oh, those
>Russian tubes!) 

Chortle.  I hear that Svetlana tubes which have handles - such as the 
8281 and the 8171 - have better quality control.  

> My Alpha 87A has been a rock for seven years -- a couple of
>minor problems here and there (bad op amp in the metering circuit and a bad
>replacement tube), but nothing related to the autotune.
/\  ¿Do you have a kaput 3CX800A7 from the Alpha 87A?  If so, name your 
price.  I would like to check a kaput tube for loose gold --  like I did 
for a dud 8877 from an MFJ/Ameritron AL-1500.  (Figure 24 on my Web site) 
 The autopsied gold-sputtered 8874 seen in the photograph in "Parasitics 
Revisited" -September/October, 1990 *QST*- came from an Alpha 3-holer 

later, Dick

>----- Original Message -----
>From: "2" <>
>To: "Dick Green" <>; "Amps" <>;
>Sent: Sunday, July 01, 2001 2:10 PM
>Subject: Re: [AMPS] ACOM Amps
>> >
>> >Tom,
>> >
>> >I'm sure ACOM is alive and well. Last I heard, they had shifted a lot of
>> >their production to the new "1000" line of manual tune amps and are
>> >a lot of them. As I understand it, they underestimated the demand for the
>> >2000A and as a result are not making enough of them. I would also suspect
>> >that their margins are better on the 1000. I guess they decided they
>> >need to advertise either one.
>> >
>> >73, Dick WC1M
>> >
>> /\   Dick -- I used to work for the Technical Support Dept. of The
>> Pacific Missile Range at Point Mugu, CA.  Our dept. repaired Collins
>> 208-U10 autotune linear amplifiers.   When a 208-U10 was in good working
>> order, it was like Godzilla rising from the ocean.  50mW in would result
>> in 15kW out. However, on average, roughly half of the 208-U10 amplifiers
>> on the Range were broken, awaiting parts and repair.   It seems that mo'
>> complicated is not always mo' betta.     An interesting parallel is the
>> Antilock Brake System on automobiles.  Even though ABS is way more
>> complex than garden-variety brakes - because it's computer controlled,
>> ABS is supposed to prevent wheel locking, thereby reducing the chance of
>> a crash.  However, Insurance company statistics show that ABS equipped
>> autos have a higher accident rate than autos equipped with ordinary
>> brakes.  My guess is that this has something to do with the ABS'use of a
>> computer.  Do computers ever Crash?
>> -  Perhaps the margin on the model 1000 ACOM is better than the margin on
>> the autotune 2000A due to the difficulties in troubleshooting autotune
>> amplifiers?
>> cheers
>> -  R. L. Measures, 805.386.3734,AG6K,
>> end
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-  R. L. Measures, 805.386.3734,AG6K,  

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