[Amps] 3-500Z convertion

[Hsu]

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 at g3rzp.wanadoo.co.uk>
To: "Hsu" <Jbenson at sohu.co>; <amps at 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 at 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
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>