>
>On Tue, 19 May 1998 07:24:50 +0000 Tom Rauch
><10eesfams2mi@mass1-pop.pmm.mci.net> writes:
To: <amps@contesting.com>
>>> Date: Sun, 17 May 1998 18:28:00 -0400 (EDT)
>>> From: km1h@juno.com
>>> Subject: [AMPS] Re: Parasitics
>>> To: amps@contesting.com
>>
>>> I have not heard an answer yet Tom...perhaps you are at Dayton but "we"
>>> patiently await your reply .
>>
>>Just got home to the unfriendly reflector. Hopefully I won't miss
>>anything by deleting MOST of the 198 messages from this and one other
>>reflector without reading them!
>>
>>> >In an amplifier that is properly tuned and not underloaded and into a
>>> >known good antenna with no intermittents, no relay problems or any
>>> >other excuse....why would it suddenly arc the bandswitch while being
>>> >operated? Assume the original design parasitic suppressor is in place
>>> >and known good.
>>
>>No one can answer a question like that with a single answer, unless
>>that person has a preconceived notion that every failure is
>>rooted in only one cause.
>
>
>Well, give it a try with as little posturing as possible.
>
[chortle]
>>
>>With that in mind, let me ask this:
>>
>>Is this an amplifier that you personally watched first hand in a test
>>setup, or are the parameters above gleaned from a second source?
>
>Both. But the amps I witnessed were not SB-220's or had 3-500Z's.
>I would still prefer to stick to the SB-220 and related clones since they
>are so popular and the majority of readers can relate to them. Roughly 4
>out of 10 SB-220's that I buy have some sort of switch damage...which is
>why they are for sale...cheap. In almost every case, the owners say the
>amp was tuned and operating perfectly fine and the switch arced for no
>obvious reason.
>
During a telephone conversation with Mr. Rauch, he told me that he had
seen lots of parasitic oscillation damage in SB-220s.
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|