: [1] 2 3 ... 10
1
Radios / Stromberg-Carlson Model 125
«  Motorola Minion April 09, 2021, 11:07:02 AM »
I can appreciate your difficulty with that S-C schematic. A Crosley, RCA, GE or Philco from the same time would be similar. I bet that different departments wanted their own document to reference. One was assembly, the other supplied parts and the

Rebuilding those condenser blocks in a Philco requires cross referencing and figuring out what parts Crosley used in some of the "fiver" series was equally challenging with those wiring maps.

That said, the variable condensers really are a sweet detail on that S-C. For a 5-tube set, that level of quality to fine-tune its RF and IF is seldom seen.
2
Chat / HAPPY EASTER!
«  Bill April 09, 2021, 08:25:55 AM »
I guess Racoons need to eat too!  ;) :)

Bill
3
Chat / HAPPY EASTER!
«  Motorola Minion April 08, 2021, 04:40:30 PM »
Even later, Happy Easter to the proud holdouts on this site. Nervous all that day, anxious about a 200 mile trip the next day to pick up a 1957 RCA color TV on Long Island, which was a generous compensation for two working 1962 RCA's. So I was a bit behind on the forum. I did get to hear a restored RCA 6HF1 while there.

For Easter, eggs were painted by us the day before. Then hidden by the bunny for my 9 YO to find, but we never found one of them. I suspect a raccoon was lurking after the bunny's early morning rounds and made off with it.
4
RCA / RCA Orthophonic Console SHF-5 need help
«  Motorola Minion April 08, 2021, 02:27:35 PM »
After you posted the schematic, I understood it was different than and SHC-4 I just picked up.

Chris recommends the screwdriver test to confirm an audio signal on the input grids pins 2 and 7 of the 6CG7s, which otherwise are at 0 volts so you can touch them to impart some stray AC to confirm its passing INTO that tube . If you measure pin 1 and pin 6 for plate DC, it should give a second clue after screw-driver hum test.

Looking at the schematic, stereo "input" goes via wafer to a sample of the speaker output, normally fed via RC network into pin 3 - cathode of V2, also used to possibly connect an amplified speaker? In other positions of the wafer switch, the tuner input which is not labeled on the schematic, is connected to that stereo "input"

RCA brochures are varied, covering certain "mark" levels of quality and hard to pin down, but may show the accessory intend for a model like yours.
5
I have to admit the kit forms of High Fidelity equipment keep impressing me as time goes on. Once at a flea market I found a Heath FM-3 tuner (gold box the size of a pound cake) and open Heath stereo amp that used PP 6BQ5 IIRC, brushed aluminum panel and sharp looking. Of course it was traded or sold back when kit forms were not yet recognized for their rugged dependability AND good specs.

Being in the Eastern US, it was not hard to find several Dynakits - possibly factory built Pre-amps both SS PAT-4 and Tube PAS-3. An SCA-80 integrated amp, Stereo 120 SS amp and the Dynaco QSA-300 (Quad - 75 watts each).

While I replaced some large speaker-coupling caps in amps over the years, they sounded great via both ADS and Polk speakers. The Dynaco SCA-80 and ST 120 is a Hafler-style circuit that is acclaimed but also can stand some improvements suggested on AK to prevent a meltdown. I never had trouble there, but always ready to make those mods in case.

I traded away my Stereo 70, which used PP EL34s. Not as powerful as the ST 120, but when run side by side with it, sounded different and many ways switching between the two pairs of speakers. The lower damping factor characteristic for the tube amp made it a better fit on the heavier ADS speakers, which compensated well.
6
RCA / RCA Orthophonic Console SHF-5 need help
«  TC Chris April 07, 2021, 09:27:15 PM »
Chris, Sorry for the delay getting back. I was waiting for another set of 6CG7 tubes to test. I installed these tubes and no change so it doesn't appear to be a tube issue. I'm not very good with schematics but I will try the 2 and 7 pins and see what happens. Just to be sure, I'm connecting these 2 pins and should get a clicking  or hum? Any other suggestions since the tubes don't appear to be the issue?

No, DO NOT CONNECT THE PINS. Just touch a screwdriver to each one alone and see if you get a click or hum. 

Chris
7
I was thinking of turntables priced at $50K, amps at $30K, etc.  Seems to me my Heath AA-22 was $99.

Chris Campbell
8
RCA / RCA Orthophonic Console SHF-5 need help
«  thermofin April 07, 2021, 06:56:53 PM »
Chris, Sorry for the delay getting back. I was waiting for another set of 6CG7 tubes to test. I installed these tubes and no change so it doesn't appear to be a tube issue. I'm not very good with schematics but I will try the 2 and 7 pins and see what happens. Just to be sure, I'm connecting these 2 pins and should get a clicking  or hum? Any other suggestions since the tubes don't appear to be the issue?

Thanks,

Guy
9
10
Chat / HAPPY EASTER!
«  19and41 April 06, 2021, 10:19:13 PM »
A late happy Easter.  The easter bunny came by and dyed my cars and sidewalks yellow.  ;D
: [1] 2 3 ... 10