[Collins] 572B and the 30L1

[Soundval]

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
>>
>>
>> 
>> ____________________________________________________________________________________
>> We won't tell. Get more on shows you hate to love (and love to hate): 
>> Yahoo! TV's Guilty Pleasures list.
>> http://tv.yahoo.com/collections/265
>>
>>
> ______________________________________________________________
> Collins mailing list
> Home: http://mailman.qth.net/mailman/listinfo/collins
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:Collins at mailman.qth.net
>
>
> ______________________________________________________
> This email was pre-scanned by Spam Guardian
> A Service Provided by http://www.foothill.net
>