[Amps] 3-500zs to 8877

[Carl]

3CPX1500A7 full output pull is around $300.

I still wouldnt make the change unless I had 4000-4200VDC under load 
available.

In that case Id rather use a YC-156 pull for around the same price and 
never have to buy a tube again. Or worry about any mistuning.

Carl
KM1H


----- Original Message ----- 
From: <sccook1 at cox.net>
Cc: <amps at contesting.com>
Sent: Wednesday, January 21, 2009 12:21 PM
Subject: Re: [Amps] 3-500zs to 8877


> Pair of 3-500Z = $360
> Single 8877 = $#@*^&!
>
> -S
>
>
>
> ---- Hsu <hsu4qro at gmail.com> wrote:
>> 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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