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This schematic shows symbols of polarized caps but says pp which I think means polypropelene. Are they calling for poly caps in the power supply ? Do I use polarized electrolytics or non polar polys?
the schematic is confusing. here is the schematichttp://www.the-planet.org/images/2A3--6SL7_small.jpg
Follow Ups:
I don't have the magazine in front of me, but if memory serves, it's 2.5k (2500 ohms). It's certainly NOT 25k. This resistor has fairly high current and voltage going through it, and therefore tends to run HOT. I actually put a small burn mark on the furniture because of this resistor. Thankfully, it was just a 'thrift store' type of cabinet. I'd use no less than a 25 watt (50W is better) resistor here, and make sure it has lots of room to breath.
nt
Original schematic from Sound Practices called for Solen Poly caps, but you could use whatever kind of cap you like, I suppose. Joe Roberts built one (a Micro 3.5) using Western Electric paper in oil caps and Magnequest DS 025 OTs. I'm about to try this circuit again with vintage paper in oils and Tango XE-20S.And the cathode resistor on the 2A3 is so high because of the amp being direct-coupled. Cathode voltage on the 2A3 is raised to the level of the plate voltage on the 6SL7, therefore, larger resistor. BTW, I've built this amp before and it sounds pretty good.
Is the cathode resistor 2.5k or 25K ?
I'm assuming that is a 2.5k on the 2.5vct , it looks like 25k. Usually this is a 750 ohm for a 2A3 tube, why is it so high?
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