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Randy Rago's Discussions

Masterpiece repair project

Started this discussion. Last reply by Randy Rago 4 hours ago. 12 Replies

I'm a member / restorer at the Asheville Radio Museum avlradiomusem.org and recently connected with a customer asking to restore a relative's Sott Masterpiece.Been in the tube radio fixin' hobby…Continue

 

Randy Rago's Page

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Randy Rago replied to Randy Rago's discussion Masterpiece repair project
"Thanks, Kent but ill work on it myself and ill post it when its done."
4 hours ago
Kent King replied to Randy Rago's discussion Masterpiece repair project
"Randy - While we do have drilling templates for some models, I am not aware of one for the Masterpiece. I could probably create one, but I won't be able to work on it for a couple weeks. Kent"
7 hours ago
Randy Rago replied to Randy Rago's discussion Masterpiece repair project
"Last question is there a template here for the wood faceplate of the masterpiece? Mine is missing."
11 hours ago
Randy Rago replied to Randy Rago's discussion Masterpiece repair project
"Ok, so i dont have a 30 ohm VC, its been changed"
11 hours ago
David C. Poland replied to Randy Rago's discussion Masterpiece repair project
"A 38 ohm voice coil will read about 30 to 32 ohms on a VTVM - about what Scott said "
12 hours ago
Alex R. Whitaker replied to Randy Rago's discussion Masterpiece repair project
"Always remember that impedance is the resistance to AC (in this case, audio) at a certain frequency.  DC resistance is completely different.  "
14 hours ago
Scott Seickel replied to Randy Rago's discussion Masterpiece repair project
"If you read the resistance value of the VC directly with an ohm meter, it will be in the range of 30% or so less than the actual impedance. "
16 hours ago
Randy Rago replied to Randy Rago's discussion Masterpiece repair project
"Yes David, thats the speaker. I isolated the VC and read the value directly. Its 14 ohms"
16 hours ago
David C. Poland replied to Randy Rago's discussion Masterpiece repair project
"Unusual to replace the voice coil on a re-cone job. I have had several examples of this speaker, used on several late 1930's  Scott models using 6V6 output tubes. My experience is about half had a bad output transformer, half of primary…"
17 hours ago
Randy Rago replied to Randy Rago's discussion Masterpiece repair project
"Good news, thanks George!"
yesterday
George replied to Randy Rago's discussion Masterpiece repair project
"Ampifier will run with only half the output power due to the lower load impedance with possible audio distortion at higher levels. Since the human ear barely discerns a 3 dB change in volume and a halving of power represents a 3 dB change in power,…"
yesterday
Randy Rago replied to Randy Rago's discussion Masterpiece repair project
"To clarify, I was told the speaker was re-coned in the past"
yesterday
Randy Rago posted a discussion

Masterpiece repair project

I'm a member / restorer at the Asheville Radio Museum avlradiomusem.org and recently connected with a customer asking to restore a relative's Sott Masterpiece.Been in the tube radio fixin' hobby since the early 70's and never came across one of these and saw a once-in- a -lifetime opportunity so of course I said YES!From what i can tell, its mostly there but I have one question for the group. I have to re-cone the speaker but it has a 14 ohm VC, not the 38 ohm i've read about here. What are my…See More
yesterday
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