Thanks Peter!
I have got a a died TL922 as a junk,I only pay $100 for it.so I don't
want pay for it too much.Althought the 3-500Z are made in China, but I call the
factory, They ask me pay $500 for a matched pair!Mr.Richard L. Measures have
mentioned in the list that 3-500Z can replace by 4-400(need some work),I have
a pair 4-400C, but I just test them, they all died!in this weekend, I check my
junk box, and find out some NOS Chinese FU-500Fs(same as 4X500A) and its
socket, I just read its datasheets , I found the screen and grid dissipation
power not too small, so,I think maybe it can work in GG and cathode drive.It
have same volt and cureent of filament as 3-500Z.
73! Hsu
----- Original Message -----
From: "Peter Chadwick" <g3rzp@g3rzp.wanadoo.co.uk>
To: "Hsu" <Jbenson@sohu.co>; <amps@contesting.com>
Sent: Sunday, July 23, 2006 7:14 PM
Subject: Re: [Amps] 3-500Z convertion
> Hsu said:
>>My TL922's 3-500Zs died,I have some 4X500As,it seems the 3-500Z can
>>convertion by 4X500A, <
> The 4X500A is an external anode tube, so the cooling won't be right, it needs
> a different socket, and it's a tetrode. You'd need to do soem careful
> calculation to determine if the grid and screen dissipations would be
> exceeded. All in all, i'd say buyin a pair of new 3-500Z is a better way to o.
> 73
> Peter G3RZP
>
>
>
>
>
> ========================================
> Message Received: Jul 23 2006, 11:54 AM
> From: "Hsu"
> To: amps@contesting.com
> Cc:
> Subject: [Amps] 3-500Z convertion
>
> Hi, I'm a new member.My TL922's 3-500Zs died,I have some 4X500As,it seems the
> 3-500Z can convertion by 4X500A, Does anyone have this experience?Thanks in
> advance!
> 73! Hsu
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