06-12-2016, 03:38 PM
My next step is usually to check all of the parts I can and make a list of parts needed or repairs needed.
I first looked at the available new transformers at Radio Daze, who sells Hammond Mfg Transformers. I also looked at transformers available at Play Things Of Past. Here is what I found:
- The cabinet was in good condition with only occasional scratches and finish loss. The knobs were original. The back cover was present and in good condition, but the retaining screws did not appear to be original. One knob spring was missing.
- The chassis rubber corner bumpers were in poor condition, and one was missing. Fortunately these are available from Renovated Radios (PHS-COR).
- Several parts that secure the two large vertical dials to the cabinet were missing. A key part of these four assemblies is a flanged bushing, shoulder bushing, or shoulder spacer (not sure what they are called). Two were missing. Fortunately I found two in my junk box which were slightly too long and could be cut down. These parts are often used in conjunction with rubber grommets to support tuning capacitors in radios. The other rubber parts used were two GPH-46-480 (a grommet with an offset groove) and 7/32” thick washers cut from a GPH-Sleeve from Renovated Radios. Two #8 x 1” round head black Philips head screws were also missing. I have not found a supplier for this screw, so I may have to use slotted zinc hardware.
- The line cord had been removed. I assume that the original was likely rubber or vinyl vs. cloth covered.
- One of the two dial pointer drive cords was off its pulley. The dial cord stringing in this radio is quite complex, and especially for the band spread dial.
- The speaker field, cone, and output transformer were OK.
- The power transformer was defective. It showed obvious signs of leaking wax. One of the two primary windings was open and one was shorted. After removal of the transformer for inspection, one primary winding was burned to a crisp. This may have been caused by shorted turns, or perhaps the radio had been connected to 230 volts when setup for 115 volts. When removed for inspection, it appeared that the transformer leads had been unsoldered and then reattached. So someone had been there before!
- The three IF transformers were OK.
- All of the RF coils and transformers were OK. I was unable to test two oscillator coils that were buried in the band switch – I could not safely access their connection points.
- Eight resistors were out of tolerance – all were carbon composition types – all but one was ½ watt. Some original resistors that had to be replaced were rated at 20% tolerance. New 20% tolerance resistors are no longer made, and I will be forced to use 10% or 5% parts. I try to use vintage parts (vs. new) when available and in tolerance.
- Five tubes were bad – either showing shorts or were weak. The original 80 tube was a tubular type which was good, but I prefer the ST or shouldered type so it will be replaced. One of the bad tubes was a 6V6 output tube (shorted) – its mate was OK but slightly weak. I picked two replacement 6V6’s from my parts stocks which had higher quality measurements and were closely matched. If the restoration goes well I may try to find two matched 6V6G tubes. The parts list calls for 6V6E GT/G so either G or GT types are acceptable.
I first looked at the available new transformers at Radio Daze, who sells Hammond Mfg Transformers. I also looked at transformers available at Play Things Of Past. Here is what I found:
- Play Things Of Past, Philco 32-8115, $18.50, used. Horizontal mounting, from a Philco model 41-295, 11 tubes, may fit chassis with minimum modifications needed. Filament current 41-295 3.8 amps, B+ 245v. The Philco 41-295 and 46-888 are similar radios except for the audio output tubes. The 41-295 uses two 42’s (6F6) while the 46-888 uses two 6V6’s.
- Radio Daze Hammond 273CZ $109.41, Horizontal mounting, will fit chassis hole, no adapter needed, 5V@3A, 6.3v@5A, 650vct@173MA Much larger than needed and expensive, but it will fit the chassis hole.
- Play Things Of Past, Philco 32-7080 NEW $35, Vertical mounting, would need an adapter plate, 5v@2A, 6.3v@5A, 720vct@123MA – a close match
- Radio Daze Hammond 273X $82.64, Vertical mounting, would need an adapter plate would, 5V@2A, 6.3v@4A, 700vct@126ma – a close match