>
>Forgive my ignorance, but, what is "zsac"? It's been a long time
>since I've worked with tubes but I don't recall such a term ever
>being used.
>
>Too bad you didn't give a real e-mail address because I wonder why
>someone that hates spam is using Juno. Last time I used Juno there
>were all kinds of advertisements that were displayed.
>
Amen.
? Every post to the AMPS group from each and every Juno user rather
obviously subjects all group members to Spam. So when is Bill Fisher
going to put Juno on the unacceptable word list along with the N-word?
Hows about it Bill?.
cheers
> 73.....Lee (KI7RW - ki7rw@arrl.net)
>
>>From: nospam4me@juno.com
To: <amps@contesting.com>
>>Date: 2/8/00 4:42:46AM
>>To: amps@contesting.com
>>Subject: [AMPS] 811a to 572b conversion
>>
>>
>>
>>:From: Lee Roberts <ki7rw@arrl.net>
>>:I have heard of a rumor about a mod for this amp that involves
>>:changing the tube to an 572 and changing a tap on the
>>:transformer. Is it true? If so, anyone have any details on this
>>:and/or experience with this?
>>
>>An 811a to 572b conversion requires some of the following
>>considerations:
>>
>>The 572b is often larger in size.
>>The zsac bias voltage will have to be reset. If it's a zener
>>diode, you'll have to replace it. Often the "string of diodes"
>>method becomes unwieldy when higher bias voltages
>>are required. 24 volts is much more practical to obtain with
>>one hefty zener diode.
>>
>>There have been reports of stability problems with
>>"higher gain 572b's." The conversions I've done gave no
>>indications of parasitics because Nichrome Suppressors
>>were installed during the retrofit.
>>I used NOS Jan tubes...
>>
>>cheers
>>skipp
>>________________________________________________________________
>>YOU'RE PAYING TOO MUCH FOR THE INTERNET!
>>Juno now offers FREE Internet Access!
>>Try it today - there's no risk! For your FREE software, visit:
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>>
>>--
>>FAQ on WWW: http://www.contesting.com/ampsfaq.html
>>Submissions: amps@contesting.com
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>>Problems: owner-amps@contesting.com
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>>
>
>
>
>--
>FAQ on WWW: http://www.contesting.com/ampsfaq.html
>Submissions: amps@contesting.com
>Administrative requests: amps-REQUEST@contesting.com
>Problems: owner-amps@contesting.com
>Search: http://www.contesting.com/km9p/search.htm
>
>
- Rich..., 805.386.3734, www.vcnet.com/measures.
--
FAQ on WWW: http://www.contesting.com/ampsfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
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