Hasn't anybody ever heard of ROLA radios or speakers? I'd be happy to send pictures of the one I have. I spoke with John of Alladin Radio in San Francisco and he was able to find two schematics for ROLA chassis that had a couple fewer tubes, but no schematic for the 7 tube chassis in my little console. The set functions but has weak output and low sensitivity. It looks like it has had some work done in the past. I'm concerned that the set is now miswired. It is also very difficult to determine the proper resistance values of the large carbon one-color resistors and the defective volume pot without some form of schematic. Any help would be appreciated. BTW, I do this stuff as a hobby, for fun. Have restored some really nice consoles and table sets, but my wife just keeps collecting them for herself and hasn't let me sell any yet. I've taught myself a lot about cabinet repair, veneer repair and replacement, and finish restoration and repair. I'm very grateful to people like John of Alladin and all the others who have offered advice and resource knowledge. My hat's off to all of the great people involved with this effort to preserve the wonderful "Era of Radio"!
San Jose, Calif.
the following schematics should be close.
no exact match found.the tube line-up for both is 1-80 , 1-45 , 1-24 , 4-27.
Steve, Thanks for the reply. I will take a close look at both of these. I really appreciate the help. It has also been suggested that this radio might be a different make wit a Rola speaker and the MODEL might be Rola. Is there any way to determine if that's the case? I can try to post some photos if you think that will help.
rola manufactured 2 low boy consoles in 1929.
model 80 & model 90.both had 6-tubes & were ac powered. in the 1920's when manufacturers
gave a tube count they usually did not include the rectifier. do not have picturers
available but someone else in the forum may.
Thank you very much for that information. Any idea where I can get copies of the Rola Model 80 and 90 schematics. No one seems to have any at the usual sources. I haven't tried AES yet, but I will tomorrow. Should I post photos of the cabinet and chassis? Would that be of any help to anyone? Your information is very helpful and I was wondering what your source was.
Hi Greg, I'll email the Rola 80/90 schematic to you but it's only 6 tubes including the rectifier. That's the only Rola schematic I have; it might be close enough to yours to be useful.
checked the rola model 80/90 schematic today.
it is a 6-tube chassis.
here are 4 more models that the schematics
are close but not exact.all use the following tube line-up.1-71 , 1-80 , 5-27
the 71 & 45 are both 4-pin triodes with the
same base but different filament voltage.
all are found in riders volume 1.
brandes page-1 , fada page-10
stromberg-carlson page-5 & zenith page-8
Steve, thanks very much for the info. Don Black was kind enough to email me a copy of the 80/90 schematic. I found one capacitor error that I removed, but the set still has very little input sensitivity. Still looking for the problem. Tha audio section seems to be fine. If I input a strong signal from a generator I get a strong output. Off the air signals just seem to get lost, especially at the mid to low end of the BC band. (This is a BC only set.) I'm still optimistic that it's a simple problem. The power supply capacitors are wired differently from the 80/90 schematic, the center 2 sections are joined, but through a 5.4k resistor. Overall the voltages seem normal, I'm looking for a leak in the signal path or something missing or in the wrong place in the front end. Since I use 27's instead of 24's in the front end the 80/90 schematic is helpful but not exact. Anyway, Thanks to you all for the help! You're great!