dcgillespie's Recent Activity

  1. dcgillespie replied to the thread MR 67 Feed thru Caps.

    I'll wait and see if they do -- otherwise, I appreciate your back channel offer. I use the ST 1000A -- such a wonderful alignment...

    Oct 21, 2017 at 6:49 PM
  2. dcgillespie replied to the thread MR 67 Feed thru Caps.

    C - Thanks for the info. Going the factory parts route then will be an issue, as the Mac Service Manual for the MR 67 only spells out...

    Oct 21, 2017 at 5:06 PM
  3. dcgillespie posted a new thread.

    MR 67 Feed thru Caps

    Does anyone know if Mac still has any inventory on these, or if not, where a source might exist? 1000 pF. Thanks in advance for any...

    Forum: McIntosh Audio

    Oct 21, 2017 at 11:22 AM
  4. dcgillespie replied to the thread FM-200-B Acquisition.

    Simply incredible Joe. The wide range of skills you bring to your work and the dedication to detail shows itself so well in the finished...

    Oct 21, 2017 at 9:00 AM
  5. dcgillespie replied to the thread Increase of 299C power.

    Old -- So I take it that R218 is not present in your unit? Dave

    Oct 21, 2017 at 8:32 AM
  6. dcgillespie replied to the thread Magnavox 116 to Guitar Amp.

    Cross -- The phase inverter is of the "Paraphase" type, and works on a most basic principle of vacuum tube operation: Any signal...

    Oct 21, 2017 at 7:53 AM
  7. dcgillespie replied to the thread Magnavox 116 to Guitar Amp.

    Cross -- Gadget has brought you a long way from your beginning concept, with everything moving in the right direction. Some additional...

    Oct 21, 2017 at 1:39 AM
  8. dcgillespie replied to the thread Increase of 299C power.

    I know that at one point, Scott stopped using the screen grid bleeder resistor, due to the heat it gave off, and its propensity to fail...

    Oct 20, 2017 at 7:46 PM
  9. dcgillespie replied to the thread Increase of 299C power.

    Old -- Check to make sure R218 is still good. That is the screen grid bleeder resistor that works to (in part) drop the voltage to the...

    Oct 20, 2017 at 5:49 PM
  10. dcgillespie replied to the thread Increase of 299C power.

    Old -- I'm not sure what data you're referencing for the 7591, but the maximum plate voltage for this tube is 550 volts, while the...

    Oct 20, 2017 at 2:44 PM
  11. dcgillespie replied to the thread Help Saving 400-CX SA-100 and 100-R Tuner.

    The triad transformer could no doubt fill the need for the B+, 6.3 vac heater, and even 5.5 volt source for the indicator lamps if a...

    Oct 19, 2017 at 8:54 PM
  12. dcgillespie replied to the thread Need help Fisher x100c buzzing.

    Time doesn't matter with most of the tri-pent tubes. The darn things are just prone to heater cathode hum in the pentode section. No...

    Oct 19, 2017 at 8:48 PM
  13. dcgillespie attached a file to the thread Taming the HH Scott 208.

    A concept schematic is attached to give an idea of how the heater regulator has been implemented into the Scott design. Also shows how...

    Scott 208 Modifications.jpg Oct 19, 2017 at 8:25 PM
  14. dcgillespie attached a file to the thread Taming the HH Scott 208.

    Resolve One of the things that always puzzled me about the 208 was the bias supply. It was built like a DC Heater supply rather than a...

    SAM_2213.JPG SAM_2234.JPG SAM_2235.JPG SAM_2239.JPG SAM_2253.JPG SAM_2254.JPG SAM_2255.JPG SAM_2259.JPG SAM_2260.JPG Oct 19, 2017 at 4:43 PM
  15. dcgillespie replied to the thread Taming the HH Scott 208.

    Train -- There have always been lingering reports of folks with Scott equipment battling notably high B+ levels. It's hardly every piece...

    Oct 19, 2017 at 11:57 AM