[Amps] 3-500zs to 8877

[Bob Maser]

Not only is the 3-500Z a more robust tube than the 8877, the 8877 requires a 
3 minute warm-up, the circuit for that would be an added complexity.  I 
agree with Hsu that the 3CX1200D7 would be a better swap, being instant on 
and using the same socket, and probably not replacement of the blower.  You 
would have to change the filament supply but that is easy.  I swapped the 
8877 in my 4K Ultra for the D7 and I haven't regretted it once.

Bob W6TR
----- Original Message ----- 
From: "DAVE WHITE" <mausoptik at btinternet.com>
To: "Donald Fox" <taurusshoguy at yahoo.com>; "Robert Morris" 
<robrk at nidhog.net>
Cc: <amps at contesting.com>
Sent: Wednesday, January 21, 2009 3:48 PM
Subject: Re: [Amps] 3-500zs to 8877


> I'd echo this sentiment. You've got a good, tried and tested amp with 
> robust tubes. Why spend the time and money (and run barefoot whilst you're 
> working on it) simply for a lower drive requirement? I may get shouted 
> down for saying this, but personally I think the 8877 is a more fragile 
> tube than the Good Ol' 3-500.
>
> Start a new amp as you collect the parts from junksales and fleamarkets. I 
> think that few people out these know what this stuff is these days so it 
> seems to command lower prices than it once did. Recently at Dayton I had 
> quite a few 1x2 and 2x1 extra class licensees come up to me and ask me 
> "what those things are". They were vacuum variable capacitors!
>
> cheers
>
> Dave G0OIL
>
> --- On Wed, 21/1/09, Robert Morris <robrk at nidhog.net> wrote:
> From: Robert Morris <robrk at nidhog.net>
> Subject: Re: [Amps] 3-500zs to 8877
> To: "Donald Fox" <taurusshoguy at yahoo.com>
> Cc: amps at contesting.com
> Date: Wednesday, 21 January, 2009, 3:36 PM
>
> Donald Fox wrote:
>> Gentlemen:
>>
>>   Just submitting a quick poll to see what the feeling is about making 
>> the
> swap from a pair of 3-500s to the almighty 8877.
>>
>>   The donor is my very good condx Henry 2K Classic X which I do not want
> to butcher. I am aware that the Henry consoles were oem equipped with the 
> 8877
> and other tubes.
>>
>>   My goal is not for more power, but to enjoy the lower drive requirement
> of the 8877 for my IC746.
>>
>>   I know that the filament xformer and socket would need to change as 
>> well
> as reworking the airflow for cooling.
>>
>>   So, can the change be done without major mods to the input/output
> networks??
>>
>>   If not, then I will drop the idea and enjoy it as is. Changing to
> another amplifier is not in the budget, and since I have a soft spot for 
> the
> 80's model Henry consoles, this one is bound to be around as long as I can
> afford it.
>>
>>   Thanks for your comments pro or con in advance.
>>
>>                                                         Don   N8ECH
>>
>>
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>>
> I'm of the "if it works, don't fix it crowd". No matter how
> good you are, you
> still messed with it. If you have the money for an 8877, start a project 
> to
> build a complete amp, even single band to start.
>
> -- 
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