AM FM Philharmonic Bleeder Resistors - EH Scott Radio Enthusiasts2024-03-28T15:11:03Zhttps://ehscott.ning.com/forum/topics/am-fm-philharmonic-bleeder-resistors?feed=yes&xn_auth=noScott;
Scott;
Thanks for the…tag:ehscott.ning.com,2018-05-09:3925821:Comment:657062018-05-09T01:12:45.014ZJoseph W Stricklandhttps://ehscott.ning.com/profile/JosephWStrickland
<p>Scott;</p>
<p>Scott;</p>
<p>Thanks for the clarification on those two resistors and the value of the Sensitivity control!</p>
<p>My friend is working on the AM-FM set. I am just trying to update the schematic for a LW-AM-SW set based on the schematic that was in the archives here. This is a separate effort from what my friend is doing. The strange thing is that this schematic was listed as being for an AM-FM set in the archives, but it is not.</p>
<p>I ran across another anomaly in this…</p>
<p>Scott;</p>
<p>Scott;</p>
<p>Thanks for the clarification on those two resistors and the value of the Sensitivity control!</p>
<p>My friend is working on the AM-FM set. I am just trying to update the schematic for a LW-AM-SW set based on the schematic that was in the archives here. This is a separate effort from what my friend is doing. The strange thing is that this schematic was listed as being for an AM-FM set in the archives, but it is not.</p>
<p>I ran across another anomaly in this schematic. There is a resistor labeled R1, that is indicated to be inside the 4th. IF detector circuit and the parts list says it is a 125 ohm 10 watt resistor. I think that is another mistake as I see no way that a 6B8G would ever be able to sustain the current required to justify a 10 watt resistor. Perhaps that should have been labeled as R10?</p>
<p>Joe</p> On both the 7 knob and the 9…tag:ehscott.ning.com,2018-05-08:3925821:Comment:654562018-05-08T23:34:03.644ZScott Seickelhttps://ehscott.ning.com/profile/ScottSeickel
<p>On both the 7 knob and the 9 knob AM sets the the 600 ohm is 500k, and the 500 ohm is 50k. They were close on the schematic, weren't they...LOL.</p>
<p>The Sensitivity control is 1k. </p>
<p>I thought you were working on an AM/FM set?</p>
<p></p>
<p></p>
<p>On both the 7 knob and the 9 knob AM sets the the 600 ohm is 500k, and the 500 ohm is 50k. They were close on the schematic, weren't they...LOL.</p>
<p>The Sensitivity control is 1k. </p>
<p>I thought you were working on an AM/FM set?</p>
<p></p>
<p></p> Norman;
Thanks for that input…tag:ehscott.ning.com,2018-05-08:3925821:Comment:654552018-05-08T18:43:32.839ZJoseph W Stricklandhttps://ehscott.ning.com/profile/JosephWStrickland
<p>Norman;</p>
<p>Thanks for that input. I suspected that was the purpose of the control, but was uncertain.</p>
<p>Do you know the value of the Sensitivity control? The ends are marked "Lo" and "Hi", but there is no "R" number shown with this control and I do not see it listed in the parts list.</p>
<p>Joe</p>
<p>Norman;</p>
<p>Thanks for that input. I suspected that was the purpose of the control, but was uncertain.</p>
<p>Do you know the value of the Sensitivity control? The ends are marked "Lo" and "Hi", but there is no "R" number shown with this control and I do not see it listed in the parts list.</p>
<p>Joe</p> "FID" = fidelity as in high f…tag:ehscott.ning.com,2018-05-08:3925821:Comment:658622018-05-08T15:45:51.489ZNorman S Braithwaitehttps://ehscott.ning.com/profile/NormanSBraithwaite
<p>"FID" = fidelity as in high fidelity. Really, it is broad bandwidth as opposed to narrow bandwidth or selective.</p>
<p></p>
<p>Norman</p>
<p>"FID" = fidelity as in high fidelity. Really, it is broad bandwidth as opposed to narrow bandwidth or selective.</p>
<p></p>
<p>Norman</p> I have another question on th…tag:ehscott.ning.com,2018-05-08:3925821:Comment:654542018-05-08T12:06:31.654ZJoseph W Stricklandhttps://ehscott.ning.com/profile/JosephWStrickland
<p>I have another question on the Philharmonic LW/AM/SW version, what is the value of the Sensitivity Control? It is not specifically identified in the parts list. There are two resistors in parallel with it, R35 (600 ohms) and R7 (500 ohms). It would make sense for the control not to be a high value since it is in the cathode circuit of the 6H6 Sensitivity Diode.</p>
<p>R33 is shown just to the right and below the Sensitivity Control and appears to have the labels "FID" and "SEL" associated…</p>
<p>I have another question on the Philharmonic LW/AM/SW version, what is the value of the Sensitivity Control? It is not specifically identified in the parts list. There are two resistors in parallel with it, R35 (600 ohms) and R7 (500 ohms). It would make sense for the control not to be a high value since it is in the cathode circuit of the 6H6 Sensitivity Diode.</p>
<p>R33 is shown just to the right and below the Sensitivity Control and appears to have the labels "FID" and "SEL" associated with it. What do those abbreviations represent? "SEL" may mean selectivity, but what does "FID" mean? And what is the function of R33?</p>
<p>Joe</p> Scott;
I need to check with m…tag:ehscott.ning.com,2018-05-01:3925821:Comment:656522018-05-01T10:51:24.978ZJoseph W Stricklandhttps://ehscott.ning.com/profile/JosephWStrickland
<p>Scott;</p>
<p>I need to check with my friend and see just what version he is working on. The schematic I downloaded from the archive here is supposed to be an AM-FM version, but so far I have not seen a discriminator in the diagram. In any case, if the unit he is working on is an AM & SW model, your diagrams should be excellent to work from. I have been taking schematics that I improved to FedEx and having them printed out on B, C or D size paper to make reading them easy. I download the…</p>
<p>Scott;</p>
<p>I need to check with my friend and see just what version he is working on. The schematic I downloaded from the archive here is supposed to be an AM-FM version, but so far I have not seen a discriminator in the diagram. In any case, if the unit he is working on is an AM & SW model, your diagrams should be excellent to work from. I have been taking schematics that I improved to FedEx and having them printed out on B, C or D size paper to make reading them easy. I download the *.pdf or *.jpg file to a memory stick and let them import the image file to print. I have a copy of AutoCad 13 Mechanical Desktop on my other computer that I used to use in order to do some work at home. I used to export EPS files to network printers at work. Our mechanical engineers used different software on Sun Unix based computers but we were able to share files through the IGES conversion process.</p>
<p>Your drawings show excellent attention to detail including the physical layout illustrations. Once I learn which version he is working on I will arrange to order copies from you. I have some work I am doing on a Fisher RK-20 remote control system for a friend in California. I recently repaired mine and will be working on the companion MF-300 tuner next. I need to get back to those projects.</p>
<p>Joe</p> I have the 7 knob version com…tag:ehscott.ning.com,2018-05-01:3925821:Comment:655462018-05-01T00:47:13.378ZScott Seickelhttps://ehscott.ning.com/profile/ScottSeickel
<p>I have the 7 knob version completely redrawn with chassis layout, parts list, coil diagrams, you name it. All laid out for easy reading. I verified this drawing against 3 early sets and they all matched up 100%. All errors in original drawing were corrected. I spent probably 150 to 200 hours drawing and verifying against 3 unmolested chassis. I offer these to people who are restoring their sets at a reasonable price as I have to print them on 18"x24" pages and it takes some time to…</p>
<p>I have the 7 knob version completely redrawn with chassis layout, parts list, coil diagrams, you name it. All laid out for easy reading. I verified this drawing against 3 early sets and they all matched up 100%. All errors in original drawing were corrected. I spent probably 150 to 200 hours drawing and verifying against 3 unmolested chassis. I offer these to people who are restoring their sets at a reasonable price as I have to print them on 18"x24" pages and it takes some time to print, mail etc. Certainly not a money making proposition- barely beer money, but I enjoyed doing it. I have not put it in the public domain because there have been plenty of people who have stolen other peoples work and sell it on E-bay. You have little recourse other than to pay a lawyer to threaten to sue them and hope they stop. Plus, I do a first run print directly from Autocad which produces a superior print compared to generating an image file or PDF. So anyway, it is offered to people who need it as a set of prints only. </p>
<p>I also have drawn the AM/FM, but I have not spent the time to verify that against my 2 AM/FM chassis. </p>
<p>The 9 knob AM only set has eluded me as the only one I have been able to acquire was molested badly. I pretty much know all the circuit differences and have drawn it out also, but I need a 9 knob AM set to verify. </p>
<p>Here is a chassis layout of the oscillator area. Again, right click the image below, then click "view image" it will expand it to be readable.</p>
<p></p>
<p><img src="https://i.imgur.com/Afuo6jX.png"/></p> Scott;
Thanks for this well t…tag:ehscott.ning.com,2018-04-30:3925821:Comment:654532018-04-30T23:33:03.920ZJoseph W Stricklandhttps://ehscott.ning.com/profile/JosephWStrickland
<p>Scott;</p>
<p>Thanks for this well thought out view of the RF Oscillator circuit!</p>
<p>Did you redraw the entire schematic? That is pretty much what I am doing at present. Maybe I am wasting time if this has already been done.</p>
<p>Joe</p>
<p>Scott;</p>
<p>Thanks for this well thought out view of the RF Oscillator circuit!</p>
<p>Did you redraw the entire schematic? That is pretty much what I am doing at present. Maybe I am wasting time if this has already been done.</p>
<p>Joe</p> If you right click the image…tag:ehscott.ning.com,2018-04-30:3925821:Comment:656972018-04-30T21:05:32.695ZScott Seickelhttps://ehscott.ning.com/profile/ScottSeickel
<p>If you right click the image above, then click "view image" it will expand it to be readable.</p>
<p></p>
<p>If you right click the image above, then click "view image" it will expand it to be readable.</p>
<p></p> This is the AM oscillator sec…tag:ehscott.ning.com,2018-04-30:3925821:Comment:655452018-04-30T20:16:49.702ZScott Seickelhttps://ehscott.ning.com/profile/ScottSeickel
<p>This is the AM oscillator section. Forget the capacitor numbers and the terminal numbers below, they are my addition to clarify the mess. </p>
<p></p>
<p></p>
<p><img src="https://i.imgur.com/j9kLvKC.png"/></p>
<p></p>
<p></p>
<p>This is the AM oscillator section. Forget the capacitor numbers and the terminal numbers below, they are my addition to clarify the mess. </p>
<p></p>
<p></p>
<p><img src="https://i.imgur.com/j9kLvKC.png"/></p>
<p></p>
<p></p>