[Collins] Re: 75S3 Questions - Update

[jeremy-ca]

The 6EA8 is the updated version of the 6U8A.

Ive also been flogging a DX-60/HG-10B on 20/40M recently but the receiver is 
a rather antique NC-101X which holds its own even on 20M during non contest 
times.

Carl
KM1H

Carl
KM1H


----- Original Message ----- 
From: "Bill Stewart" <bstewart at ipass.net>
To: <Collins at mailman.qth.net>
Sent: Wednesday, February 27, 2008 2:11 PM
Subject: [Collins] Re: 75S3 Questions - Update


> Once again, thanks for the info.
> To Robert Jefferis: Thanks for clearing up the mysterious C29, which I
> missed on the schematic. The one I took out has the same Collins part nr. 
> as
> on my parts list. I did replace all Sangamo molded caps, all 'lytics and 
> the
> B+ and bias diodes. I'm saving the old parts and maybe one day I can find
> out how to read the date codes. I suppose my rcvr could be somewhat dated 
> by
> the fact it uses 6U8A's instead of 6EA8's plus used the S/T diodes. Your
> trans. seems to run cooler than mine. I measured the temp. after about 2
> hrs. The first 30 mins. it is just barely warm. One more note on the
> 6BF5...even on the tube tester it gets really hot. Yes, the B+ 'lytic is a
> bit tuff to get too, but I did manage and replaced with a can type. BTW, 
> all tubes cked. ok (gas & shorts too).
>
> To Jerry, K0CQ: Thanks for all your input Jerry. After replacing the S/T
> cube diode in the bias supply, the 6BF5 bias went from about -8vdc
> to -11vdc. The 6BF5 in my rcvr is V10.
>
> To Bob, K4TAX: I think the main hum problem was taken care of with the
> replacement of C29. There is a bit of background hum, which I don't notice
> with the antenna connected...background noise masks it.  There may be some
> on phones which was addressed with a svc. bulletin. Don't recall seeing
> the shield you mentioned...may be missing on my rcvr.
>
> Now I have it hooked up with a DX-60B/HG-10B and making contacts. Thanks 
> again
> for all the info and help. This is a first class list...73 de Bill K4JYS
>
>
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