I'm gonna try once more with the antique radios

[TUD1]

Thank you. It's one of the two merits of living in Birmingham. The other is Milo's Hamburgers.

[mpatoray]

The Mix of tubes in a radio or TV can sometime give a clue as to how long it was used. For the most part all radios and TV's where populated with manufacture branded tubes, there are rare exceptions to this though. As the set gets used the owner starts putting in different brands when old tubes go bad. That is of course unless that did insist on factory branded tubes or lived in a small town and only had one choice. The more motley mix of tubes the longer it was probably used.

I have an RCA 14" portable set I picked up only the Rectifier and CRT where still RCA and of the tubes installed 14 out of 23 tested very weak or had shorts.

[TUD1]

This is the only non original tube.

[dieseljeep]

Originally Posted by TUD1

This is the only non original tube.

Philco used tubes made by Sylvania and RCA. All the loctals were Sylvania and many of the octals were either Sylvania or RCA. The original 50L6, could be easily RCA sourced.
For some reason, Philco used a lot of variations in their tube line-ups. The schematic, from the radio in question, shows either a 35Z5 or a 35Z3 and the difference in the pilot light wiring.
BTW, the coupling capacitor, #40, still should be replaced, otherwise the new 50L6, can be damaged.

[jr_tech]

Originally Posted by dieseljeep

Philco used tubes made by Sylvania and RCA. All the loctals were Sylvania and many of the octals were either Sylvania or RCA. The original 50L6, could be easily RCA sourced.

Take a close look at your "Genuine Philco Tubes" for MFG codes, I suspect that you might find codes for RCA (274) or Sylvania (312) stamped on the tube, along with date code letters or numbers. More info here:
http://www.triodeel.com/eiacode.htm

jr

I agree about changing the cap... it may well have caused the failure of the RCA 50L6.

[dieseljeep]

Originally Posted by jr_tech

Take a close look at your "Genuine Philco Tubes" for MFG codes, I suspect that you might find codes for RCA (274) or Sylvania (312) stamped on the tube, along with date code letters or numbers. More info here:
http://www.triodeel.com/eiacode.htm

jr

I agree about changing the cap... it may well have caused the failure of the RCA 50L6.

Pre-war tubes didn't have the EIA codes on them. Philco tubes didn't have it until the late 40's, as well as Silvertone and some other tubes that were supplied by Sylvania.

[mpatoray]

Did you ever get either of those VCR's working?

[TUD1]

With the help of another AHRS member, we got the dial cord "fixed." That is to say, it is attached, but the tension is a little weak and the pointer is not connected. I checked the tubes on the tube tester and replaced a few. We glued a hole in the speaker and replaced some capacitors. I made sure to replace the cap mentioned earlier in the thread. Next time, I want to get the dial cord finished and get a few more capacitors replaced.

[TUD1]

Originally Posted by TUD1

With the help of another AHRS member, we got the dial cord "fixed." That is to say, it is attached, but the tension is a little weak and the pointer is not connected. I checked the tubes on the tube tester and replaced a few. We glued a hole in the speaker and replaced some capacitors. I made sure to replace the cap mentioned earlier in the thread. Next time, I want to get the dial cord finished and get a few more capacitors replaced.

Didn't y'all read my post? I already replaced the cap!

[TUD1]

After some fiddling, I was able to get the shortwave function to work. I was able to pick up several British stations, one in Spanish, and one I believe in Japanese. That's pretty cool that I can pick up stations halfway 'round the world.

[Gregb]

The tube went bad most likely because cap #40 is leaky and needs to be replaced, if not replaced the new tube will go bad as well. Philco did not make tubes, they bought them from other manufacturers and had their name put on them. I do believe I read someplace that Sylvania made Philco tubes, cant recall for sure though.

Gregb

[Electronic M]

As a restorer and an Electrical Engineering student less than an academic year from graduating; I can tell you that contrary to any claims by marketing departments one brand of tube was almost never better than any other...The exceptions were where circuits pushed tubes too far (such as the RCA CTC-17 tv IIRC ate 6GH7 tubes like candy and some brands could take the abuse better), tubes that were originally bad designs (many 6X5 tubes were prone to shorting and destroying the power transformer, however some brands later improved the design to make it safer), and some off brands (places that did not make radios/TVs/electronics or rebadged the cheapest crap they could get)particularly the budget and Japanese brands would produce inferior product and/or do other fishy stuff.

And definitely change that cap!

[mpatoray]

Good to see your are getting that radio back in shape!

As for your SL-5000 there are TONS of caps in it, but the problematic ones are the Blue Sanyo caps, replace them and then you might be getting somewhere

[TUD1]

I WAS going to go to the meeting today, but I overslept 3 HOURS on account of being forced to go to an INCREDIBLY STUPID HIGH SCHOOL FOOTBALL GAME!! God how I DESPISE the game.

[mpatoray]

Just remember though Football and baseball spawned some of the best announcers, and some awesome innovation in radio and tv. it also sold and continues to sell LOTS of sets. Although not enough to make the fraud that was 3D TV take off