[Amps] 3-500zs to 8877

Hsu hsu4qro at gmail.com
Wed Jan 21 10:32:13 EST 2009


3CX1500D7 is better,
   It use  same socket as 3-500Z.
           Hsu
----- Original Message ----- 
From: "Val Erwin" <val.erwin at sbcglobal.net>
To: <amps at contesting.com>; "Donald Fox" <taurusshoguy at yahoo.com>
Sent: Wednesday, January 21, 2009 11:23 PM
Subject: Re: [Amps] 3-500zs to 8877


> Hi Donald:
> 
> A good example of the change you would like to achieve is available by viewing the Ameritron series of amps. Specifically, compare the AL-82 (2 X 3-500s) to the AL-1500 (single 8877).(You can download the manuals)
> 
> Both amps use the same power suppply and the same chassis. Despite owning an AL-1500, I have never explored what they do about the difference in filament voltages between the two models.
> 
> These two models of Ameitron amps run very high plate voltage as compared to say a Heathkit SB-220 or a Henry etc.............This higher plate voltage is really what is needed to make an 8877 "play".
> 
> I am currently exploring a similar project: Placing an 8877 in an Alpha 78
> 
> GL
> 
> Val a.k.a. W5PUT
> 
> --- On Wed, 1/21/09, Donald Fox <taurusshoguy at yahoo.com> wrote:
> 
> From: Donald Fox <taurusshoguy at yahoo.com>
> Subject: [Amps] 3-500zs to 8877
> To: amps at contesting.com
> Date: Wednesday, January 21, 2009, 2:11 PM
> 
> 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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