> Hello Hsu:
>
> If you are able to call the factory directly, is it possible to obtain the
> specification data sheets for the 3-500ZG?
>
> I have tried for years to obtain the specs, but they do not seem to be
> available. Even if they are in Mandarin, perhaps we could get them
> translated. I have used these triodes from Pride, for many years, with
> excellent results. I wonder if your factory is making the Pride triode?
>
> Your help for all of us here would be most appreciated. Maybe they even
> have English version able.
>
> Many thanks in advance.
>
> 73 and Happy DXing,
>
> Mike
> W2AJI
> ----- Original Message -----
> From: "Hsu" <Jbenson@sohu.com>
> Cc: <amps@contesting.com>
> Sent: Sunday, July 23, 2006 8:14 AM
> Subject: Re: [Amps] 3-500Z convertion
>
>
> > 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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