[Amps] Source for good 572B's tubes?

[Carl]

Hsu, I also believed there is only one 572B manufacturer in China but the 
Shunguan's I have been buying direct from China have a much thicker graphite 
anode than the bad Taylors I have here to compare with.

In a Clipperton L they are very stable even at 1100-1200W on 10M and show no 
color at 350-400W (1400-1600W PEP) carrier as an AM linear. Drive is 25-30W 
carrier.

Carl


----- Original Message ----- 
From: "Hsu" <hsu4qro at gmail.com>
To: "James McKellips" <w4nft at mckellips.net>; <amps at contesting.com>
Sent: Friday, March 22, 2013 10:29 PM
Subject: Re: [Amps] Source for good 572B's tubes?


> There is only a 572B's manufactorer in China. That means if you purchase 
> Chinese 572B,even diffirence logo,but  same quality.another option 
> ,Russian 572B, but I heard of that tube can not fit RF service.only for 
> audio.
> IMO, maybe you drive the 572B too hard or you PA with problem.It shoul be 
> with longer tube life.
>   73!Hsu
>
> -----原始邮件----- 
> From: James McKellips
> Sent: Saturday, March 23, 2013 6:04 AM
> To: amps at contesting.com
> Subject: [Amps] Source for good 572B's tubes?
>
> Hello listers,
>
> I am looking for a good source of 572B tubes. I have been buying them off 
> eBay and these are Chinese tube. They haven't last more than a year. Any 
> have any ideas, I would appreciate it. Please send email to 
> w4nft at mckellips.net
>
> Thank you and 73,
>
> Jim, W4NFT
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