One-Owner McMurdo-Silver Masterpiece VI found in Canada - EH Scott Radio Enthusiasts2024-03-29T09:55:28Zhttps://ehscott.ning.com/forum/topics/mcmurdo-silver-masterpiece-vi-found-in-canada?commentId=3925821%3AComment%3A119393&feed=yes&xn_auth=noNice find Felix, congratulati…tag:ehscott.ning.com,2021-09-23:3925821:Comment:1199622021-09-23T13:55:38.770Zpalegreenthumbhttps://ehscott.ning.com/profile/palegreenthumb
<p>Nice find Felix, congratulations!</p>
<p>Nice find Felix, congratulations!</p> Next time you're in Michigan.…tag:ehscott.ning.com,2021-09-16:3925821:Comment:1195022021-09-16T15:14:20.477ZRobert Feenstrahttps://ehscott.ning.com/profile/RobertFeenstra
<p>Next time you're in Michigan....</p>
<p>Next time you're in Michigan....</p> Good morning Robert,
Sounds…tag:ehscott.ning.com,2021-09-16:3925821:Comment:1195012021-09-16T12:42:57.917ZFelix-A. Gravelhttps://ehscott.ning.com/profile/gravel
<p>Good morning Robert,</p>
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<p>Sounds like I owe you a round of beer or ten. Thank you SO much for taking the time.</p>
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<p>I'll put this information to good use. Cheers from Quebec city,</p>
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<p>Felix</p>
<p>Good morning Robert,</p>
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<p>Sounds like I owe you a round of beer or ten. Thank you SO much for taking the time.</p>
<p></p>
<p>I'll put this information to good use. Cheers from Quebec city,</p>
<p></p>
<p>Felix</p> I hooked up 15.26 volts AC to…tag:ehscott.ning.com,2021-09-16:3925821:Comment:1193932021-09-16T02:09:24.315ZRobert Feenstrahttps://ehscott.ning.com/profile/RobertFeenstra
<p>I hooked up 15.26 volts AC to the primary, and got 30.5 volts on both secondary's. 1:2 ratio.</p>
<p>I hooked up 15.26 volts AC to the primary, and got 30.5 volts on both secondary's. 1:2 ratio.</p> I did measure and can confirm…tag:ehscott.ning.com,2021-09-16:3925821:Comment:1190582021-09-16T01:59:31.738ZRobert Feenstrahttps://ehscott.ning.com/profile/RobertFeenstra
<p>I did measure and can confirm the 4K but I measure 1.64K on the primary. I'll try to determine the ratio</p>
<p>I did measure and can confirm the 4K but I measure 1.64K on the primary. I'll try to determine the ratio</p> Does this help? From a Maste…tag:ehscott.ning.com,2021-09-16:3925821:Comment:1193892021-09-16T01:15:40.904ZRobert Feenstrahttps://ehscott.ning.com/profile/RobertFeenstra
<p>Does this help? From a Masterpiece VI that Russ Webb rebuilt. I did not measure but found this written on the transformer. I assume Russ did that. I had to open it up anyway since I had a light show inside one of the tubes and wanted to check all components.…<a href="https://storage.ning.com/topology/rest/1.0/file/get/9571528456?profile=original" rel="noopener" target="_blank"><img class="align-full" src="https://storage.ning.com/topology/rest/1.0/file/get/9571528456?profile=RESIZE_710x"></img></a></p>
<p>Does this help? From a Masterpiece VI that Russ Webb rebuilt. I did not measure but found this written on the transformer. I assume Russ did that. I had to open it up anyway since I had a light show inside one of the tubes and wanted to check all components.<a href="https://storage.ning.com/topology/rest/1.0/file/get/9571528456?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/9571528456?profile=RESIZE_710x" class="align-full"/></a></p> As Bill Liers pointed out, wh…tag:ehscott.ning.com,2021-09-15:3925821:Comment:1190572021-09-15T21:57:38.067ZFelix-A. Gravelhttps://ehscott.ning.com/profile/gravel
<p>As Bill Liers pointed out, what I'm actually missing is the interstage transformer. </p>
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<p>Turns out the output transformer is in the speaker base, and what's labelled as T10 Audio Transformer on the schematic is actually the audio interstage transformer. As you can see in this picture of my set, it is entirely missing from the chassis (should be located right between the rectifier and output tube sockets). …</p>
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<p>As Bill Liers pointed out, what I'm actually missing is the interstage transformer. </p>
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<p>Turns out the output transformer is in the speaker base, and what's labelled as T10 Audio Transformer on the schematic is actually the audio interstage transformer. As you can see in this picture of my set, it is entirely missing from the chassis (should be located right between the rectifier and output tube sockets). </p>
<p></p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/9571220471?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/9571220471?profile=RESIZE_710x" class="align-full"/></a></p>
<p><span style="font-size: 8pt;"><em>Note : this is NOT my handiwork...</em></span></p>
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<p>IF I can find out the DC resistance of each winding and the ratio of that transformer, my friend Patrick Dufresne of the S.Q.C.R.A. would be up to the challenge of winding me a new one using an old spare core.</p>
<p><br/><em><strong>Does anyone have a spare Masterpiece V or VI power supply chassis sitting around they could take these measurements from? Better yet, possibly sell me the transformer?</strong> </em></p>
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<p>Thank you very much,</p>
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<p>Felix</p> Thanks for the kind comments…tag:ehscott.ning.com,2021-09-15:3925821:Comment:1193882021-09-15T21:09:48.243ZFelix-A. Gravelhttps://ehscott.ning.com/profile/gravel
<p>Thanks for the kind comments Dave. I'll be sure to get in touch with you.<br></br> <br></br> <cite>Dave said:</cite></p>
<blockquote cite="https://ehscott.ning.com/forum/topics/mcmurdo-silver-masterpiece-vi-found-in-canada#3925821Comment119492"><div><div class="xg_user_generated"><p>Hello Felix</p>
<p>Welcome to the forum ! I enjoy seeing what appears to be the original finish to a rare cabinet. I've two of these sets and hope you eventually enjoy them as I do near daily. Love the OES, we've owned…</p>
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<p>Thanks for the kind comments Dave. I'll be sure to get in touch with you.<br/> <br/> <cite>Dave said:</cite></p>
<blockquote cite="https://ehscott.ning.com/forum/topics/mcmurdo-silver-masterpiece-vi-found-in-canada#3925821Comment119492"><div><div class="xg_user_generated"><p>Hello Felix</p>
<p>Welcome to the forum ! I enjoy seeing what appears to be the original finish to a rare cabinet. I've two of these sets and hope you eventually enjoy them as I do near daily. Love the OES, we've owned sheepdogs for years and know they enjoy a good listen. If you can't source schematics local I have a few to share copies of. PM me here. </p>
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</blockquote> Bill,
Sounds like you got th…tag:ehscott.ning.com,2021-09-15:3925821:Comment:1193872021-09-15T21:07:49.852ZFelix-A. Gravelhttps://ehscott.ning.com/profile/gravel
<p>Bill,</p>
<p></p>
<p>Sounds like you got that right. The O.T. is indeed located inside the base. I got confused as the schematic calls my missing transformer <em><strong>T10 Audio Transformer.</strong></em></p>
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<p>I can have one made. I have a friend who rewinds transformers and he is up for the challenge. If I can figure out the DC resistance of each winding and the ratio, he says he could probably whip one up using an old core. I suppose I have some digging to do. Back to the…</p>
<p>Bill,</p>
<p></p>
<p>Sounds like you got that right. The O.T. is indeed located inside the base. I got confused as the schematic calls my missing transformer <em><strong>T10 Audio Transformer.</strong></em></p>
<p></p>
<p>I can have one made. I have a friend who rewinds transformers and he is up for the challenge. If I can figure out the DC resistance of each winding and the ratio, he says he could probably whip one up using an old core. I suppose I have some digging to do. Back to the drawing board... </p>
<p><br/> <cite>Bill Liers said:</cite></p>
<blockquote cite="https://ehscott.ning.com/forum/topics/mcmurdo-silver-masterpiece-vi-found-in-canada#3925821Comment119495"><div><div class="xg_user_generated"><p>Hi Felix,</p>
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<p>Is it possible that the missing transformer T 10 is the interstage transformer and the output transformer is in the speaker pedestal?</p>
<p></p>
<p>regards, Bill</p>
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</blockquote> Hi Felix,
Is it possible tha…tag:ehscott.ning.com,2021-09-15:3925821:Comment:1194952021-09-15T14:06:31.161ZBill Liershttps://ehscott.ning.com/profile/BillLiers
<p>Hi Felix,</p>
<p></p>
<p>Is it possible that the missing transformer T 10 is the interstage transformer and the output transformer is in the speaker pedestal?</p>
<p></p>
<p>regards, Bill</p>
<p>Hi Felix,</p>
<p></p>
<p>Is it possible that the missing transformer T 10 is the interstage transformer and the output transformer is in the speaker pedestal?</p>
<p></p>
<p>regards, Bill</p>