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The Fine Things are Always Hand Made

Randy Rago
  • Brevard, NC
  • United States
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Randy Rago's Discussions

800B tuning motor not as scary as i thought

Started Nov 2 0 Replies

A customers' 800B. the tuning motor was getting juice, but didn't move. winding showed continuity so i opened her up and surprised to find that there's not much in there to go wrong. no commutator,…Continue

Serial# info

Started this discussion. Last reply by Kent King Jan 17. 1 Reply

Masterpiece # JJ345 ?

Part # 1445, voltage divider network

Started this discussion. Last reply by David C. Poland Jan 13. 20 Replies

Or if in the Zenith world, a "Candohm". In the masterpiece, its 3825; 980; 780; 1975 ohms. Im replacing it with discreet power resistors. 5 or 10 watters?

Masterpiece / Super XII overlap? transitional?

Started this discussion. Last reply by David C. Poland Dec 4, 2025. 8 Replies

My Masterpiece has a dual 10Uf / 350v can, one cap in the G2/Cathode bias circuit of the first audio 6K7 and the other cap in what appears to be 3rd grid/plate circuits of all tubes. This…Continue

 

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Kent King liked Randy Rago's discussion 800B tuning motor not as scary as i thought
Wednesday
Randy Rago posted a discussion

Untitled

A customers' 800B. the tuning motor was getting juice, but didn't move. winding showed continuity so i opened her up and surprised to find that there's not much in there to go wrong. no commutator, no armature windings, etc.its built like an AC phono motor. this one was stuck from some brown goo between the armature and the field coils. cleaned, lubed and back together. as they say down under 'bob's your uncle'See More
Nov 2
0 Comments
Kent King replied to Randy Rago's discussion Serial# info
"Thanks...I have that one in the database already. It was probably built in the summer of 1941. Kent"
Jan 17
Randy Rago posted a discussion

Serial# info

Masterpiece # JJ345 ?
Jan 17
1 Comment
David C. Poland replied to Randy Rago's discussion Part # 1445, voltage divider network
"Congrats. You are now in a good position if/when you encounter another."
Jan 13
Randy Rago replied to Randy Rago's discussion Part # 1445, voltage divider network
"it lives! All voltages per spec, last hurdle was a non-responsive eye tube, traced to low AVC. that old rumor about micas rarely going bad, well i had two bad ones tn the AVC! heres a shot of the plate i fabricated, he set goes back to its owner on…"
Jan 13
Randy Rago replied to Randy Rago's discussion Part # 1445, voltage divider network
"Kent, a privilege to meet you. At this time, I dont need any more parts. The set belongs to a client who MAY want to acquire more original cosmetic parts. I will put him in touch with this group when I return the set to him. Thanks"
Jan 6
Kent King replied to Randy Rago's discussion Part # 1445, voltage divider network
"The Masterpiece was released after the Super XII was discontinued. Knowing how Scott reused parts, I'm not surprised at the similarities. With the exception of the Laureate, all the sets from the Philharmonic through WW2 are basically the same…"
Jan 6
David C. Poland replied to Randy Rago's discussion Part # 1445, voltage divider network
"Randy -  I regard the 14 tube Scott Masterpiece as a souped up Super 12. It changed from a single 6J5 tube driver to push-pull pair of 6J5 drivers in the Masterpiece. The final (3rd) version Super 12 receiver also has 6 rather than 4 controls,…"
Jan 6
Randy Rago replied to Randy Rago's discussion Part # 1445, voltage divider network
"one more detail that may be interesting. this unit, No. JJ345, has circuitry that matches the Super VII up to the 3rd IF/AVC/ and 1st audio section. here there is a dual 10UF can that does not appear in the Masterpiece schematic. they have been…"
Jan 6
Randy Rago replied to Randy Rago's discussion Part # 1445, voltage divider network
"David, Although this is my first Scott, I've been in this since '72. the approach i've developed is first, power supply electrolytics, next audio section, then tuner section. this method has proven quick and effective for me. I…"
Jan 6
David C. Poland replied to Randy Rago's discussion Part # 1445, voltage divider network
"In recent years, I have been testing at voltage the old caps I have removed. Using an EICO 950B Comparative Bridge I restored. Most caps leak badly. I replace all the caps in higher voltage circuits before ever using a Variac to apply power, while…"
Jan 6
David C. Poland replied to Randy Rago's discussion Part # 1445, voltage divider network
"Yes Kent is.  Also, co-author of the Scott Collectors Guide, 2nd edition. And the primary force behind this Scott Enthusiasts web site."
Jan 6
Randy Rago replied to Randy Rago's discussion Part # 1445, voltage divider network
"Excuse me, Mr. King, are you Kent A. King, one of the founders of the Scott Historical Society?"
Jan 5
Randy Rago replied to Randy Rago's discussion Part # 1445, voltage divider network
"👍"
Jan 5
Kent King replied to Randy Rago's discussion Part # 1445, voltage divider network
"Randy - Dave's suggestion is one he and I have used in the past. I'll check to see if there are socket voltages, but <in general> you should see higher voltages (150-250) on pins 3 (plate) and 4 (screen) for most of the RF/IF and…"
Jan 5

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