All the transformers in my R-4 receivers get hot to the touch under normal
conditions. However, the presence of 5.2 volts of ripple indicates you may
have other problems that don't necessarily point to a bad cap. Could be a
power supply diode is bad or a tube is drawing excessive current. In the
c
--- Peter Hoon <[EMAIL PROTECTED]> wrote:
> 4) Has anyone actually drilled out this filter cap
> shell, and mounted discrete components inside?
Peter,
I have not done this on the R-4x series, and am just
getting ready to do it on my AC-4 power supply, but I
have done it on several older BCB tab
;ll be here in another hour or so.)
> 73,
> Al, W8UT
> New Bern, NC
> BoatAnchors appreciated here
> http://www.thecompendium.net/radio/
> http://www.hammarlund.info
>
> ----- Original Message -----
> From: "VE3AX" <[EMAIL PROTECTED]>
> To: "Peter Hoon"
ginal Message -
From: "VE3AX" <[EMAIL PROTECTED]>
To: "Peter Hoon" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Thursday, March 18, 2004 7:21 AM
Subject: Re: [drakelist] Filter Cap on Drake R4A
>
> Peter:
>
> In addition to Herbert's exc
Herbert,
Regarding your points 5 through 7, it has been my experience that if any section
of a multi-section cap becomes defective it is only a matter of time before the
remainder of the sections fail, either open or short. The latter condition, of
course, is the worst case.
I only parallel a ca
: <[EMAIL PROTECTED]>
Sent: Wednesday, March 17, 2004 10:37 PM
Subject: [drakelist] Filter Cap on Drake R4A
>
> R4A: It appears that one or more sections of the Sangamo power supply
filter
> cap are defective, since I measure 5.2 volts p - p with a scope at the
> junction
Peter,
i do not own a R-4A, but i may have some practical comments:
1.) A large ripple voltage combined with excessive trans-
former heating may also point to an overload
condition,
not necessarly may it only be one or more failed
cap's.
So, before doing any repair, i would suggest
to
R4A: It appears that one or more sections of the Sangamo power supply filter
cap are defective, since I measure 5.2 volts p - p with a scope at the
junction of diodes D4 and D5 (156 VDC). And my power transformer gets very
hot.
The cap is in a single aluminum Sangamo chassis mount with:
100 MFD
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