That's right Roger, the suffix has undergone a few revisions...it was a
3CX1200A7, then a 3CX1200D7, now it's a 3CX1200Z7.
I think the improvement iterations related to internal grid construction
differences and reduced feedback C resulting in improved stability. The
filament voltage was changed originally from 7.5 to 6.3 V too I think.
I've not used this tube but it looks alike a modern metal ceramic beefed-up
incarnation of the venerable 3-500Z / 3-1000Z class of glass tube.
Leigh
VK5KLT
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Roger (K8RI)
Sent: Monday, 30 July 2012 4:39 PM
To: amps@contesting.com
Subject: Re: [Amps] Dedicated RF / tube query
On 7/29/2012 11:50 PM, Leigh Turner wrote:
>
> Yes indeed Dick....instant-on thoriated tungsten filament tubes are nice!
>
> But alas, the rather pricey 3CX1200 can't be second-sourced :-(
Didn't they change the suffix on the 3CX1200 to something new?
I don't know if the bias is the only thing changed with the tube
designation.
73
Roger (K8RI)
>
> Leigh
> VK5KLT
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of Richard Solomon
> Sent: Monday, 30 July 2012 1:09 PM
> To: amps@contesting.com
> Subject: Re: [Amps] Dedicated RF / tube query
>
> Or better yet, one or two 3CX1200's.
>
> 73, Dick, W1KSZ
>
> On Sun, Jul 29, 2012 at 8:26 PM, Leigh Turner
> <invertech@frontierisp.net.au> wrote:
>
>>
>> Hi Dan,
>>
>> Not that it matters much, but are you absolutely certain that the current
>> 3CX800/3CPX800A7 tube products sourced from CPI are not of Chinese origin
>> and instead supplied to CPI under an OEM outsourcing supply agreement
>> with bespoke Eimac labelling / badging done by the China tube factory?
>>
>> Also I'm curious about the rationale for using two little puppies in
>> parallel instead of a single 3CX1500A7/8877 tube...it sounds like you
>> have given this key decision a lot of thought?
>>
>> Leigh
>> VK5KLT
>>
>>
>> -----Original Message-----
>> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
>> Behalf Of Dan Simmonds
>> Sent: Monday, 30 July 2012 9:30 AM
>> To: garyk9gs@wi.rr.com
>> Cc: amps@contesting.com
>> Subject: Re: [Amps] Dedicated RF
>>
>> Gary, this is a myth, quite frankly, saying the days of this tube are
>> numbered. Do you have facts to back this up?
>>
>> From experience I'll share with you that I can cut a Purchase Order to
>> Eimac (CPI) tomorrow for any number of 3CPX800 tubes and receive them
>> about 90 days later. No-one in Palo Alto, CA has mentioned anything to
>> me about stopping production of this model.
>>
>> I'm trying hard not to turn this into an advertisement, but for
>> comparison, we sell the identical tubes you mention (CPI / Eimac) for
>> under $700 new - and my invoiced cost per-tube from CPI is well below
>> this.
>>
>> Genuine Eimacs - not Chinese, etc.
>>
>> Dan KK3AN
>>
>
> ++SNIP++
>
>
>
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>
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