[Amps] 572Bs

[Hsu]

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 at yahoo.com>
To: <amps at 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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