[Amps] 4K Ultra Restoration

[Ron Spencer]

Will the 8877 d7 work in place of a a7 I think there might be some 
Difference. I thought the d7 was more like a 500 z

Ron

----- Original Message ----- 
From: "Bob Maser" <bmaser at tampabay.rr.com>
To: "AMPS" <amps at contesting.com>
Sent: Sunday, December 04, 2005 12:34 AM
Subject: [Amps] 4K Ultra Restoration


> Well, I found a 4K Ultra, brought it home, and started to clean up the 
> years
> of cigarette tar that this amp had been subjected to.  Not a pretty sight
> but fixable.  My first surprise was finding that some previous owner had
> replaced the original 240VAC blower with a pair of 115VAC muffin fans
> connected in series.  Does anyone out there have a blower that will fit?
> Can someone tell me what was the original blower used in the 4KU?  Looking
> at the Grainger catalog, it looks like the only one they sell that could
> possibly work is the Dayton 4C869, which is 230VAC @ 1600 RPM but I'm not
> sure of the opening size match.
>
> Also, I pulled out the 8877 and I believe it is the original.  It has what 
> I
> think is a date code printed on the top of the anode cap "7707" and I 
> assume
> that this is from the 7th week of 1977.  It may be older than the amp
> because the amp uses a ceramic 2000pf Jennings cap in C2, which I 
> understand
> was glass when the amp was first introduced in 1971 and later on they
> started using the more modern ceramic cap.  My amp does not have a serial
> number label so I don't know how old it really is.  I haven't gotten the 
> RF
> deck off the cabinet yet so I don't know how many surprises are under 
> there.
> The amp was operational when I first saw it about a month ago although it
> took about 100W to get 1500W out of it so I am going to have to replace 
> the
> 8877.  Anyone have one for sale at a reasonable price?  Ultimately I am
> planning on installing the new Eimac 3CX1500D7 but for now I just want to
> clean it up let it make RF.
>
> Help is appreciated,
> Bob Maser  W6TR
> Valrico, FL
>
>
>
>
> Bob
>
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