08-01-2010, 07:21 AM
Hi Guys, this is my first post on this Phorum, so please be gentle.
I have in the past worked on quite a few Australian made Philco radios, these shared some parts with U.S. made radios (knobs, cabinets etc) however I've been asked to repair a 89 / 19 model, made in the good 'ol U S of A.
The block capacitors had me puzzled until I remembered talking to Ron some time ago and heading off in search of his web site. I found the Philco sites (thankfully) and downloaded the info on block caps, circuits etc. I have a set of Riders manuals on hand so a quick scan of the data and I was set to have a serious play!
Long story cut short is that I have most of the radio sorted with a couple of bits left to tidy up. The power tranny is model 8046-N, not listed on the transformer pages I visited. Not a real worry as the radio is being swapped over to real power (240 volts
) so Ill follow the normal voltage trail and pick a suitable Oz transormer to do the job. There are a couple of other differences in that there is no capacitor block 7625-D shown on the parts overlay, this sits next to the wire-wound back bias resistor. Still working out how the caps are wired into that one as there are two circuits showing different ways of wiring the tone caps from the plate. Both show the bottom end of the caps going to the top end of the back bias resistor, however in circuit they are returned straight to chassis ground by the mounting screw. Am I missing something on this one?
I have to say that the set is pretty cramped to work on. To add some pressure all the wires are losing their insulation so a full rewire with appropriate cloth-covered wire may be coming up.
I should have a tranny in place in the next couple of days, then will come the slow power up and no doubt some serious questions for the brains behind this great site.
Be in touch soon.
Best Regards
Kevin Chant
Perth
Western Australia
I have in the past worked on quite a few Australian made Philco radios, these shared some parts with U.S. made radios (knobs, cabinets etc) however I've been asked to repair a 89 / 19 model, made in the good 'ol U S of A.
The block capacitors had me puzzled until I remembered talking to Ron some time ago and heading off in search of his web site. I found the Philco sites (thankfully) and downloaded the info on block caps, circuits etc. I have a set of Riders manuals on hand so a quick scan of the data and I was set to have a serious play!
Long story cut short is that I have most of the radio sorted with a couple of bits left to tidy up. The power tranny is model 8046-N, not listed on the transformer pages I visited. Not a real worry as the radio is being swapped over to real power (240 volts
) so Ill follow the normal voltage trail and pick a suitable Oz transormer to do the job. There are a couple of other differences in that there is no capacitor block 7625-D shown on the parts overlay, this sits next to the wire-wound back bias resistor. Still working out how the caps are wired into that one as there are two circuits showing different ways of wiring the tone caps from the plate. Both show the bottom end of the caps going to the top end of the back bias resistor, however in circuit they are returned straight to chassis ground by the mounting screw. Am I missing something on this one?I have to say that the set is pretty cramped to work on. To add some pressure all the wires are losing their insulation so a full rewire with appropriate cloth-covered wire may be coming up.
I should have a tranny in place in the next couple of days, then will come the slow power up and no doubt some serious questions for the brains behind this great site.
Be in touch soon.
Best Regards
Kevin Chant
Perth
Western Australia
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