[Amps] Amps Digest, Vol 229, Issue 20

[chris at chrishays.com]

What I have read is that when RF Parts was working to get good quality 
572Bs from China, many batches were returned to China, and it is thought 
that these wound up on EBAY and other sites dirt cheap.

So its buyer beware: Buy tubes from reputable dealers at reasonable 
prices.  Good dealers will offer a warranty.

Chris AB6QK

------ Original Message ------
From: amps-request at contesting.com
To: amps at contesting.com
Sent: 1/23/2022 09:00:02
Subject: Amps Digest, Vol 229, Issue 20

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>Today's Topics:
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>    1. Re: new Alpha (Rob Atkinson)
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>----------------------------------------------------------------------
>
>Message: 1
>Date: Sat, 22 Jan 2022 17:57:41 -0600
>From: Rob Atkinson <ranchorobbo at gmail.com>
>To: MU 4CX250B <4cx250b at miamioh.edu>
>Cc: BILL KENNAMER <k5fuv at prodigy.net>, Louis Parascondola
>	<gudguyham at aol.com>, 	"amps at contesting.com" <amps at contesting.com>
>Subject: Re: [Amps] new Alpha
>Message-ID:
>	<CALWD7Z4jUQDY4KL9pMCayJD-7Zk-9WzE=e8sHivaAWgzHvk=8w at mail.gmail.com>
>Content-Type: text/plain; charset="UTF-8"
>
>On Sat, Jan 22, 2022 at 8:31 AM MU 4CX250B <4cx250b at miamioh.edu> wrote:
>>  Is there hard evidence that Chinese tubes are inferior?
>
>If you mean statistical data, I don't know of any.  RF Parts may keep
>track of this.
>
>I'm only aware of claims made by hams regarding duds from China.  But
>there are all kinds of operators, some skilled and some who don't know
>how to handle a tube properly, plus results vary across tube types and
>years and factories I think.  I have a pair of RF Parts 3-500ZGs in an
>amplifier that are Chinese but they've been working FB for 21 years.
>OTOH I've heard all sorts of negative comments regarding Chinese 811As
>and 572Bs.
>
>Rob
>K5UJ
>
>
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>End of Amps Digest, Vol 229, Issue 20
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