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Re: [Amps] 3-500zs to 8877

To: "'Amps'" <amps@contesting.com>
Subject: Re: [Amps] 3-500zs to 8877
From: "Peter Voelpel" <df3kv@t-online.de>
Date: Wed, 21 Jan 2009 19:35:23 +0100
List-post: <amps@contesting.com">mailto:amps@contesting.com>
The table in the Eimac power grid tubes booklet shows the better figure for
the 3-5ooZ.

73
Peter 

-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Hsu
Sent: Mittwoch, 21. Januar 2009 18:29
To: sccook1@cox.net
Cc: amps@contesting.com
Subject: Re: [Amps] 3-500zs to 8877

But 8877 have better 3rd IMD performance.Maybe longer tube life.
----- Original Message -----
From: <sccook1@cox.net>
Cc: <amps@contesting.com>
Sent: Thursday, January 22, 2009 1:21 AM
Subject: Re: [Amps] 3-500zs to 8877


> Pair of 3-500Z = $360
> Single 8877 = $#@*^&!
> 
> -S
> 
> 
> 
> ---- Hsu <hsu4qro@gmail.com> wrote: 
>> 3CX1500D7 is better,
>>    It use  same socket as 3-500Z.
>>            Hsu
>> ----- Original Message ----- 
>> From: "Val Erwin" <val.erwin@sbcglobal.net>
>> To: <amps@contesting.com>; "Donald Fox" <taurusshoguy@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@yahoo.com> wrote:
>> > 
>> > From: Donald Fox <taurusshoguy@yahoo.com>
>> > Subject: [Amps] 3-500zs to 8877
>> > To: amps@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
>> > 
>> >       
>> > _______________________________________________
>> > Amps mailing list
>> > Amps@contesting.com
>> > http://lists.contesting.com/mailman/listinfo/amps
>> > 
>> > _______________________________________________
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