[Collins] 572B and the 30L1

[k6xyz]

I have always liked my tunes right side up.

Regards

Dave Harmon
CCA 97-535
K6XYZ[at]sbcglobal[dot]net
Sperry, Ok.

-----Original Message-----
From: collins-bounces at mailman.qth.net
[mailto:collins-bounces at mailman.qth.net] On Behalf Of Soundval
Sent: Thursday, March 29, 2007 1:23 PM
To: collins at mailman.qth.net
Subject: Re: [Collins] 572B and the 30L1

Is there any reason that one should not turn the Amps so that the tunes 
would be vertical?

Gene Rippen

>I second that Glen, these tubes have the plate alignment correct. One of 
>the RCA 811's I took out of service had the plate about 15 degrees from 
>vertical. They were code dated 1963. But as you point out, horizontal is 
>just asking for trouble.
>
> Smith Bradford
> W9HAK
>
>
> Glen Zook wrote:
>> Be VERY careful when using Chinese 572B tubes in
>> amplifiers like the Collins 30L-1 and the Heath SB-200
>> which have the tubes mounted horizontally. Unfortunately, the Chinese 
>> tubes do not always have
>> the tube elements mounted in the same plane as the
>> original Taylor and other U.S. manufactured tubes. The unfortunate result

>> of this is that the elements
>> often "sag" and short out taking power supply
>> components with them.
>>
>> The Russian tubes generally do not suffer from this
>> defect and they are MUCH safer to use in amplifiers
>> with the horizontally mounted tubes.
>>
>> Glen, K9STH
>>
>>
>> --- w9hak <w9hak at insightbb.com> wrote:
>>
>> I just installed the 572B in my 30L1. They tune the
>> same as the 811's. I was able to install them via the
>> top cover after unplugging the amp. The Chinese 572B's
>> have a slightly longer guide pin and may not pass
>> through the chassis hole. Enter the Dremel tool, just
>> nip off  the amount required to get the tube to pass
>> thought the chassis opening.
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> Glen, K9STH
>>
>> Website:  http://k9sth.com
>>
>>
>> 
>>
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>>
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