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The diyAudio First Watt M2x
The diyAudio First Watt M2x
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Old 23rd September 2018, 05:35 PM   #671
JSA1971 is offline JSA1971  Canada
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BTW your IPS bolts are a well-chosen length, congratulations. Nelson Pass gently mocked 6L6 and me for installing quite long bolts (20mm!) in the first M2x build. See posts #13 and #17 in this thread. Most of the sting has dissipated, with the passage of time.[/QUOTE]

Iíve heard that itís not the size of the bolt that matters, but how you use it 😉Lol. Iíll also probably end up using the longer bolts, Iím 95% done with my parts purchases 🙌🏻. Canít wait to get soldering!
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Old Yesterday, 05:38 PM   #672
PH104 is offline PH104  United States
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The diyAudio First Watt M2x
Quote:
Originally Posted by Mark Johnson View Post
Phil, if you decide to cook up your own Zobel network to match your own Edcor transformer, I'm sure a lot of readers here would love to see a frequency response plot of your Edcor (a) using the Official M2 Schematic design and parts values of the Zobel; and also (b) using your final choice of Zobel network, that you settled upon after experimenting with the Edcor on your Analog Discovery 2, using your new optimized parts values.
You bet Mark. I built a test board using a stripped down OPA604 Tucson board powered directly from a +/- 15VDC supply and some parts (C2, C3, R7, R6, RV1) on the main board. I put test points at the ends of the R5C1 Zobel to be able to test some variations. My first measurements will be over the batch of 6 Edcors, with and without Zobel, to see what extent - if any - matching is important. Getting the data is easy but it's been too long since I've used a spreadsheet for graphing but hope to have some plots in a few days.

Phil
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