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 case of a tube, I would pull them out one at at time, starting with the AF output tube while monitoring the ripple voltage. You didn't say how you measure the ripple voltage but I imagine you used a scope. A scope would also tell you what kind of waveform you're getting and help point out a diode problem. > > 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 200 VDC > 100 MFD 200 VDC > 100 MFD 200 VDC > 20 MFD 20 VDC > > 1) Anyone have a spare from an R4A they are parting out? > > 2) Suggestions for a source for this filter cap from others who have > gone before me. > > 3) Have improvisors found discrete caps from a source (pse recommend > one), left the chassis mount unit alone, and mounted these discrete caps > under the chassis? > > 4) Has anyone actually drilled out this filter cap shell, and mounted > discrete components inside? > > Any other ideas or comments appreciated. > > Peter, VE1CHS > > ---------------------------------------------------------------------- > Submissions: [EMAIL PROTECTED] > Subscribe: [EMAIL PROTECTED] - subscribe drakelist in > body Unsubscribe: [EMAIL PROTECTED] - unsubscribe > drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help > in body of message Brought to you courtesy of TLCHost.net > http://www.tlchost.net/ > ----------------------------------------------------------------------
---------------------------------------------------------------------- Submissions: [EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ ----------------------------------------------------------------------
