Masterpiece VI - EH Scott Radio Enthusiasts2024-03-29T00:58:16Zhttps://ehscott.ning.com/forum/topics/masterpiece-vi?commentId=3925821%3AComment%3A75874&feed=yes&xn_auth=noGlad to help Rob. Good luck…tag:ehscott.ning.com,2020-02-16:3925821:Comment:758122020-02-16T22:53:59.418ZJon Ketronhttps://ehscott.ning.com/profile/JonKetron
<p>Glad to help Rob. Good luck on your rebuild!</p>
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<p>Jon</p>
<p>Glad to help Rob. Good luck on your rebuild!</p>
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<p>Jon</p> Thank you Jon. Your pics are…tag:ehscott.ning.com,2020-02-16:3925821:Comment:760212020-02-16T19:06:18.122ZRobert Feenstrahttps://ehscott.ning.com/profile/RobertFeenstra
<p>Thank you Jon. Your pics are helpful as they confirm a couple of components that are there but don't appear on the schematic. The schematic and parts list calls the one a 1 meg pot not a 500k. But, my testing would say that aq 500K would work better.</p>
<p>Thank you Jon. Your pics are helpful as they confirm a couple of components that are there but don't appear on the schematic. The schematic and parts list calls the one a 1 meg pot not a 500k. But, my testing would say that aq 500K would work better.</p> Rob,
After plotting values o…tag:ehscott.ning.com,2020-02-02:3925821:Comment:758942020-02-02T23:49:39.469ZJon Ketronhttps://ehscott.ning.com/profile/JonKetron
<p>Rob,</p>
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<p>After plotting values on a chart, my findings indicate the pot is indeed linear. Original control within the Masterpiece VI I am servicing appears to utilize two separate pots sandwiched together. </p>
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<p>Front section 500K ohm</p>
<p>Back section 100K ohm</p>
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<p>Pictures below of the original set up:…</p>
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<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/3844794930?profile=original" rel="noopener" target="_blank"><img class="align-full" src="https://storage.ning.com/topology/rest/1.0/file/get/3844794930?profile=RESIZE_710x" width="700"></img></a></p>
<p>Rob,</p>
<p></p>
<p>After plotting values on a chart, my findings indicate the pot is indeed linear. Original control within the Masterpiece VI I am servicing appears to utilize two separate pots sandwiched together. </p>
<p></p>
<p>Front section 500K ohm</p>
<p>Back section 100K ohm</p>
<p></p>
<p>Pictures below of the original set up:</p>
<p></p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/3844794930?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/3844794930?profile=RESIZE_710x" width="700" class="align-full"/></a></p>
<p></p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/3844803183?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/3844803183?profile=RESIZE_710x" width="700" class="align-full"/></a></p>
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<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/3844803657?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/3844803657?profile=RESIZE_710x" width="700" class="align-full"/></a></p> Hi Rob,
I received your voic…tag:ehscott.ning.com,2020-01-26:3925821:Comment:758782020-01-26T23:41:12.682ZJon Ketronhttps://ehscott.ning.com/profile/JonKetron
<p>Hi Rob,</p>
<p></p>
<p>I received your voice message, apologies for not returning your call sooner. Dave had also contacted me mentioning your question here on the forum. I still have the customers Masterpiece VI here at the house. Let me retrieve the tuner chassis and I can submit values here on your topic, as well as pictures of the current set up.</p>
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<p>Will be back soon,</p>
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<p>Jon</p>
<p>Hi Rob,</p>
<p></p>
<p>I received your voice message, apologies for not returning your call sooner. Dave had also contacted me mentioning your question here on the forum. I still have the customers Masterpiece VI here at the house. Let me retrieve the tuner chassis and I can submit values here on your topic, as well as pictures of the current set up.</p>
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<p>Will be back soon,</p>
<p></p>
<p>Jon</p> Robert - interesting resoluti…tag:ehscott.ning.com,2020-01-26:3925821:Comment:758762020-01-26T02:58:03.468ZDavid C. Polandhttps://ehscott.ning.com/profile/DavidCPoland
<p>Robert - interesting resolution on the bass control. Kudos, especially that you like the result.</p>
<p>*</p>
<p>In a related vain, E H Scott seemed to shy away from bass emphasis, as reflected in the mid 1930's Scott radios in my collection. I find I have to listen carefully for the low register sounds - they are clear and they are not at all muddy, but I wish there was a bit more bass available. With my 5 knob AW-23 of 1935 (Laureate Grande), I prefer a portable disk player with the mega…</p>
<p>Robert - interesting resolution on the bass control. Kudos, especially that you like the result.</p>
<p>*</p>
<p>In a related vain, E H Scott seemed to shy away from bass emphasis, as reflected in the mid 1930's Scott radios in my collection. I find I have to listen carefully for the low register sounds - they are clear and they are not at all muddy, but I wish there was a bit more bass available. With my 5 knob AW-23 of 1935 (Laureate Grande), I prefer a portable disk player with the mega bass feature into the phono input for music. My 7 knob AW-23 (Roslyn) seems a bit better in this regard. In contrast, my 14 tube Scott Masterpiece (1940/ Scott Mayfair credenza) sounds great with a normal CD player to phono input.</p> I have emailed Jon but have n…tag:ehscott.ning.com,2020-01-25:3925821:Comment:758742020-01-25T04:53:54.648ZRobert Feenstrahttps://ehscott.ning.com/profile/RobertFeenstra
<p>I have emailed Jon but have not received a response as yet. I also have a MP V that I purchased from him and have met him.</p>
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<p>I've been playing/experimenting with the bass control system. The 100K control is, as Kent said, connected to the volume control. itis the typical bass compensation circuit using a tap on the volume control. The thing I don't like about it is that when the bass control in in the max position, the compensation network is tied to ground through a 5K…</p>
<p>I have emailed Jon but have not received a response as yet. I also have a MP V that I purchased from him and have met him.</p>
<p></p>
<p>I've been playing/experimenting with the bass control system. The 100K control is, as Kent said, connected to the volume control. itis the typical bass compensation circuit using a tap on the volume control. The thing I don't like about it is that when the bass control in in the max position, the compensation network is tied to ground through a 5K resistor. THis cuts the treble dramatically. I suppose it makes the bass appear to be bigger but it it is not a good sound. i've fixed the compensation at a particular level by putting a resistor in series to ground. I may actually leave it this way as the bass control (with the improper control) now boosts the bass without changing the treble. I'll see what a new control brings!</p> I also asked a friend (Jon) w…tag:ehscott.ning.com,2020-01-25:3925821:Comment:760682020-01-25T03:43:50.880ZDavid C. Polandhttps://ehscott.ning.com/profile/DavidCPoland
<p>I also asked a friend (Jon) who is a very experienced high end radio restorer and has restored McMurdo Silver models, including recently an MP6, to see what he can add. Meanwhile I think Kent's suggestion is on point.</p>
<p>I also asked a friend (Jon) who is a very experienced high end radio restorer and has restored McMurdo Silver models, including recently an MP6, to see what he can add. Meanwhile I think Kent's suggestion is on point.</p> Thanks Kent. I have a contro…tag:ehscott.ning.com,2020-01-24:3925821:Comment:757712020-01-24T15:31:51.144ZRobert Feenstrahttps://ehscott.ning.com/profile/RobertFeenstra
<p>Thanks Kent. I have a control on order. I was playing with it using a 300K audio for the 1meg. Most of the bass control happened in the last 1/4 of the travel. Not sure what a 1 meg will do.</p>
<p>Thanks Kent. I have a control on order. I was playing with it using a 300K audio for the 1meg. Most of the bass control happened in the last 1/4 of the travel. Not sure what a 1 meg will do.</p> I suspect (but don't know for…tag:ehscott.ning.com,2020-01-24:3925821:Comment:757682020-01-24T12:43:12.809ZKent Kinghttps://ehscott.ning.com/profile/KentKing
<p>I suspect (but don't know for sure) that you'd want an audio (log) taper for the bass control. A linear control is going to change very rapidly - the "useable" control range will be very limited. On the schematic for the MP VI, it is P3a/b (dual pot, as you noted). The values according to the parts list I have are a 100K and 1M ohm. So I'd see if Mark can make you a 100K/1M audio taper setup for this. The wiper connected to the LC circuit off the volume control tap is the 100K pot. </p>
<p>I suspect (but don't know for sure) that you'd want an audio (log) taper for the bass control. A linear control is going to change very rapidly - the "useable" control range will be very limited. On the schematic for the MP VI, it is P3a/b (dual pot, as you noted). The values according to the parts list I have are a 100K and 1M ohm. So I'd see if Mark can make you a 100K/1M audio taper setup for this. The wiper connected to the LC circuit off the volume control tap is the 100K pot. </p> You might try a search on thi…tag:ehscott.ning.com,2020-01-21:3925821:Comment:758702020-01-21T04:06:37.381ZDavid C. Polandhttps://ehscott.ning.com/profile/DavidCPoland
<p>You might try a search on this site for McMurdo Silver. May be helpful.</p>
<p>There have been some MS threads.</p>
<p>You might try a search on this site for McMurdo Silver. May be helpful.</p>
<p>There have been some MS threads.</p>