[Collins] 572B and the 30L1

[Terry Hart]

I guess it depends which hemisphere you live in.....

Terry 'VFO

----- Original Message ----- 
From: "Soundval" <soundval at foothill.net>
To: <collins at mailman.qth.net>
Sent: Thursday, March 29, 2007 7:22 PM
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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