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Messages - Motorola Minion

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1
Zenith / Re: 1964 Zenith console with drop-in tuner
« on: December 05, 2017, 03:25:09 PM »
The remainder of the odd-ball caps came from Justradios. A bunch of 220/470pf caps in the amp have cracks in them, weird. A non-polar electrolytic is used in the tuner and I ran out of Y2 safety caps.
I plan to put a grounded cord on this console to reduce noise and make sure the AUX cord I add does not become a tad hot via the chassis ground. Besides that, the cord looks pretty crummy.

I hope to test the radial speakers on this first, after moving it into the living room for break-in use. The SS console is serving as a padded tool-table, hard to lift lid.

2
Motorola / Re: Motorola SK16W
« on: December 05, 2017, 03:18:05 PM »
Great work and musical entertainment.  I ended up changing quite a few ceramic caps to film caps in my Motorola SK112 amp, mpx, preamp and tuner. I think they stopped using so many wax-paper in later models.

3
Chat / Re: Christmas Decorations
« on: December 05, 2017, 03:03:49 PM »
Just found a set of barely-used C-9 (bigger outdoor) lights circa 1960s at the ReStore. They look unique and vintage but suspend safely under the ceiling bead-boards of the full-width front porch. Plugged into a vintage Intermatic timer and GFI outlet, you can make them safe and practical. Limit the on-time to 6-11pm. Heck, I might add a dimmer to extend lamp life.

These Westinghouse originals might use more juice than intense LED or all the aged, dying twinkle strings but you can at least repair them.  BTW- C-9 is an "intermediate" lamp base between C-7 candelabra and A-medium (Edison base).

4
Other Solid State Console Brands / Re: Packard Bell RPC-66
« on: December 01, 2017, 02:17:52 PM »
Had to replace the idler wheel in this V-M changer, it was so glazed, I could not bring it back by roughing up with emery cloth.

Also needed three motor mount gromments to line it up with the motor shaft. Here is the replacement cartridge, Tetrad TK-7.

5
Other Solid State Console Brands / Re: Packard Bell RPC-66
« on: December 01, 2017, 01:54:48 PM »
I finally got the chassis re-capped with all 105 degree C caps from justradios. Chassis build quality made it a delight to work on, as good as a Zenith but with a few PC boards like a Magnavox.
 
All this chassis electrolytic caps measured higher than marked, sometimes double. A response post to one I made on another forum about this odd finding, suggested that as aluminum oxidizes, it expands and decreases distance between "plates", raising capacitance before it fails. The voltage breakdown test failed even at 25V for the few I tested, on my old school ap tester.

The original 1000 mf black power supply caps were "Nashville electronics", a few were Ducati, but most of the blue ones were Nichicon. Being 50 years old, even better quality caps go bad.

One of the Mallory pots, second from left (volume with push-off power), was mashed down hard a few times, breaking the tiny tabs holding it together. The separation is visible on the middle section, such that the wiper contact could have separated. i soldered a pair of #18 copper "straps" from front to back, clamping it as I did so.

 Its ready to go back in the cabinet.

6
Magnificent Magnavox / Re: Unknown Model
« on: December 01, 2017, 01:20:38 PM »
Congratulations, I was hoping you would get it. the model sticker on mine was stuck inside the cabinet, on the back of the record compartment. Date was on the side. Happy Hunting!

7
Sightings / Webcor Musicale Coronet - PA
« on: December 01, 2017, 01:17:00 PM »

8
Chat / Re: Happy Thanksgiving!
« on: November 23, 2017, 08:31:35 PM »
I wish all the regulars and those lurking here a healthy and happy holiday.

Reading your trails makes my own stuff seem trivial. I had eye surgery a month ago and a 25-yr friend who has a bunch of old radios had a seizure and cant drive for 6 months. We keep going and look up to those older and the wisdom that comes with being even 70, 80, 90 etc

I too am glad not to be alone in my appreciation of quality home entertainment electronics and learned a good bit about music from you guys as well.

I had Billy Vaughn's "other" Hawaiian album on the 1960 Mag Symphony this evening. Cheers!


9
Electronics / Re: Ceramic cartridges
« on: November 21, 2017, 11:38:04 AM »
Most of the ceramic carts I see were used on equipment like consoles, rather than components. I would hazard a guess that the additional 100X of amplification needed for getting sound from a 3 millivolt output (versus a 300 mV ceramic, or even 3v crystal on low-priced portables) created more problems for reducing hum.

A compromise that higher tracking force of ceramic (2-6 grams) maybe also increased options for cheaper stylus materials.

10
Electronics / OEM caps measure high - PB solid state pre-amp
« on: November 21, 2017, 11:31:43 AM »
While working on the preamp section of a 1966 Packard Bell Console RPC-66, covered by SAMS 902, I have found some common Nichicon caps, the last few I need to replace.

The problem: C315 and C316 are labeled as 25 mf @ 3 volt and measured 124ufd (!) on a Fluke DMM.

C317, 318 and 319 labeled 50 uf @ 6V measured 221 ufd. I will double check on the EICO 950 but expect the same and checking for breakdown voltage, which the 950 does up to 500v, on a 6 volt cap is just impractical.

Note that my intended new replacement caps, measure 26 and 48 uf respectively. I'm used to original parts measuring lower, but not this.

Do these caps fail by increasing in capacitance? I expected a decrease in capacitance attendant with an increase of ESR.

11
Magnificent Magnavox / Re: Help identify my Magnavox
« on: November 20, 2017, 12:05:38 PM »
The "stereo" position is for phono, and the changer needs to be on for the amp to receiver power. That separate master off switch is a great feature to be sure.

I have an identical model, 1ST208F - restored 2 yrs ago and played it just yesterday. There is no FM mpx adapter on mine, so I use the "Multiplex" selection for the aux input.

Also has the same amp 175-67 and 5703 tuner as yours. 15" speakers for low frequency and cone mid and tweeter. The Collaro changer has an EV26 Ceramic flip-over cartridge.

Its in the bedroom, to match the other mahogany furniture.

12
Zenith / Re: 1964 Zenith console with drop-in tuner
« on: November 17, 2017, 01:28:54 PM »
I have changed the plug and am ready to try the extension speakers on the solid state Zenith combo. The tube console needs its caps changed first.

13
Chat / Re: LP shelving
« on: November 17, 2017, 01:24:47 PM »

I've heard good things about the RCA 6-RF-9, but I'll stick with the Zenith on principle since they were willing to pay Colonel Armstrong for his FM patents right along.

Amen, I feel a bit guilty using FM on any RCA :-\ I have an H724 (very common 1951 model) with the Armstrong FM sticker on the back.

14
Chat / Re: LP shelving
« on: November 17, 2017, 01:19:19 PM »
Your Mustang must be a V-8.  Those two drain plugs were not a big deal if the car was up on a lift.  Pontiac put the oil filter in the oil pan on the 2.5 liter engines in 1988 only.  Never did figure out whose idea that was.  Not a big deal to service, again, as long as the car was on a lift.  Those Zenith radios are good performers as long as they don't suffer from SMD.  One of mine does, so it is a parts set.

The classic barbershop radio - dependable and sounds as sweet as a German set of the same vintage. I think the electrostatic tweet is the key.


I have a Zenith H845, also the "Interlude" model for 1961 and it had SMD in just one of the IF transformers. I was able to get the values and add external caps to fix it. That band switches can get loose rivets, causing similar issues.

15
Chat / Re: Console ID Help maybe RCA
« on: November 17, 2017, 01:15:05 PM »
Thanks for the help. I might have to put a bid on it

I have a new Zenith with swing out speakers and I had no clue how the speakers were working because the speaker wire isn't plugged in. When you said the hinges are the wires on the Motorola that has to be the same on the Zenith. I'll have to check that out. Thanks

That Zenith MP500 is the same one I restored for a customer a year back. There are 18-20ga speaker wires tucked in the cabinet (for moving them outward) with an RCA plug and jack on speakers, then redundant connections via the hinges.

I had to remove all hinges and clean all the connections of the corrosion, though it was in great physical condition otherwise.

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