[drakelist] R4C repair

Hi all,   I recently re-tubed my R4C and added filters and extra crystals. To my surprise, after three great days, the receiver would not turn on. I detected smoke around the function switch but other than that I have no idea what went  wrong. Could you suggest the best person/place for Drake

Re: [drakelist] R4C repair tip

Good tip Carlo:  it is going into my Drake file.   Merry Christmas!   Mike W4DL - Original Message - From: carlobianconi To: drakelist@www.zerobeat.net Sent: Monday, November 28, 2005 1:21 PM Subject: [drakelist] R4C repair tip Hallo, just few words on a new

[drakelist] R4C repair tip

Hallo, just few words on a new ( for me ) problem on an R4C PTO not working. Checked the + 11V supply, not present. Changed C165, tantalum cap. The supply goes OK, but the pto, now oscillating, is warbling up and down in frequency on a random basis. Dismounted and changed the 8 V zener diod