The Chinese 572B's manufacturer Jingguang just a second-rate tube
manufacturer in China.
The best glass bottle maunfacturer is BOE Groups(http://www.boe.com.cn/)
and Sanle Groups,.( 3-500Z 's manufacturer, it produce vacuum tube since
1935,http://www.sanle.com/index.asp)
BOE's miniature tube is the best tube in China
My father give me a 6 vacuum tubes radio in 1995, it was made in 1960, but he
use it till 1985!only replace a 6Z4(6X4).
It can operated until now!all tubes were made by BOE.
But BOE close their tube product line in 1980s.
73!Hsu
----- Original Message -----
From: "Paul Manuel" <k4pdm@yahoo.com>
To: <amps@contesting.com>
Sent: Thursday, January 20, 2011 11:16 PM
Subject: Re: [Amps] 572Bs
>
>
> Thanks for all the responses. Looks like there is no real concensus on
> current Russian or Chinese tube quality. Lots of different experiences.
>
> Maybe some work better in some amplifier designs than others. Maybe not all
> the tubes with the same label are made in the same factory. Who knows.
>
> I'm leaning toward ordering the Russian 572Bs from Louisiana because of
> quicker shipping and response if I have a problem.
>
> I do know about the parasitic supressor issue and am supposed to be getting
> new ones soon from the previous owner, he ordered the wire and resistors
> before he decided to sell the Clipperton L.
>
> Thanks again & 73, Paul K4PDM
>
>
>
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