In recent years, Chinese 3-500Z and 572B have changed manufacturers. They
are now manufactured by Hua Guang Tube Co., Ltd. - (hgdzg.com)
<http://www.hgdzg.com/en-US/index.html> , a few hundred meters from my
house. These two tubes are mainly supplied to foreign markets, and I don't
know how their quality control is.
73s Hsu
gudguyham--- via Amps <amps@contesting.com> 于2022年12月8日周四 06:00写道：
> You would think if someone is asking a premium price for a used amp that
> it worthy of that cost. Somebody buying an using 887$ or 3cx800 should be
> knowledgeable on how to treat those tubes.
>
>
> Sent from the all new AOL app for iOS
>
>
> On Wednesday, December 7, 2022, 4:52 PM, Rob Atkinson <
> ranchorobbo@gmail.com> wrote:
>
> I agree with Jim VE7RF on the exposed anode tubes. You may have a
> good 8877 amp and it will outlast you but your perspective is not that
> of someone entering the market. What if he goes for an 8877 or 3cx800
> amplifier and gets stuck with a dud. Now he has to find a good tube.
> Check the prices of those tubes new. Sure, if a buyer has a buddy who
> won't stick him then that's different. For example, I wouldn't
> recommend a BTI amp with a 3-1000 to someone unless the seller is his
> friend and he's done a demo and throws in a good spare. Ditto for a
> 4-1000 homebrew job. If I were looking for 500 watts it would be a
> no-brainer--I'd look for one of those AL80Bs.
>
> 73
> Rob
> K5UJ
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