Kevin,
Great news...glad we were able to help.
Yes, the Sherwod mods are super...My R-4Chere has every Sherwood mod on
it.
It is a first class contest rcvr now.
So, IF you are wanting to really make it a keeper, some or all the mods
are worthwhile.
Go to Rob Sherwoods site and check it all out....
To give you an idea how good those mods are...I have a Ten-Tec Oion II
which is a pretty good highend TCVR and I have done a lot of A/B
testing between the R-4B and the TT....The Drake does about as good
MOST of the time as tha modern TT radio!
Of course there are many nice features on the TT...but I rarely can't
hear anything on my R-4C that the TT can't. AND I am talking in crowded
band conditions or DX pileup!
http://www.sherweng.com/
73,
Lee
-----Original Message-----
From: Kevin Nathan <k...@comcast.net>
To: k4oah <k4...@mindspring.com>
Cc: drakelist <drakelist@zerobeat.net>
Sent: Sun, Jan 16, 2011 12:45 am
Subject: Re: [Drakelist] Noise In R4-C
Hi Gary,
I'm sending this copied to the list as well so Evan and Lee can see the
results. I pulled the cover off the R4C tonight and my wife and I
exchanged
those tubes with each other. Her smaller fingers were invaluable
getting V4
back into its spot. <GRIN> It's been perking for an hour or more now
and
the noise is gone. Thank you so much for that suggestion. I think I
might
investigate the solid state replacements that Evan suggested through
Sherwood Engineering though but for now the problem seems fixed.
Help from all of you is very much appreciated. Take care everyone and
very
73.
Kevin :)
Amateur Radio: K7RX
-----Original Message-----
From: Garey Barrell [mailto:k4...@mindspring.com]
Sent: Saturday, January 15, 2011 11:46
To: k...@comcast.net
Cc: drakelist@zerobeat.net
Subject: Re: [Drakelist] Noise In R4-C
Kevin -
Lee has a couple of good possibilities, but first try swapping V4 with
V6 and see if it makes a difference. The 6EJ7 at V4 has a reputation
for getting noisy, and you might have to try a couple three 'new' ones
to find a quiet one. Once you find one however, it should last for
years.
A noisy tube is less of a problem at V6 or even at V2.
If no luck here, the next most likely suspects are C62 and C63, but
you're talking scope and troubleshooting to isolate beyond that.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Kevin Nathan wrote:
Hi All,
I would like to draw on the wisdom of the group here. My R4-C seems
to be developing a sort of frying noise when I am listening. It is
really apparent on SSB but also now is getting worse on AM as well.
It does not seem to effect audio quality but is running competition
at
times with the received signal. Does anyone have an idea what this
might be? Someone mentioned that there is a particular tube, perhaps
a 6EJ7, that gets gassy and can cause this. Any thoughts?
Thanks all and very 73.
Kevin :)
Amateur Radio: K7RX
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