"David, all the panel parts are missing but i can cut a wood panel, better than nothing for now"
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Masterpiece repair project
Started this discussion. Last reply by Randy Rago 6 hours ago. 14 Replies 0 Likes
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
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"you proposing to cut a panel if you had a pencil drawing as a pattern?
And do you have escutcheons for controls, eye and dial crystal?"
"Thanks, Kent but ill work on it myself and ill post it when its done."
"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"
"Last question is there a template here for the wood faceplate of the masterpiece? Mine is missing."
"Ok, so i dont have a 30 ohm VC, its been changed"
"A 38 ohm voice coil will read about 30 to 32 ohms on a VTVM - about what Scott said "
"Always remember that impedance is the resistance to AC (in this case, audio) at a certain frequency. DC resistance is completely different. "
"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. "
"Yes David, thats the speaker. I isolated the VC and read the value directly. Its 14 ohms"
"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…"
"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,…"
"To clarify, I was told the speaker was re-coned in the past"
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
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