| Quick list of changes [message #4283 is a reply to message #4276] |
Mon, 07 May 2007 07:18  |
SteveBrown
Messages: 330
Registered: May 2009
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Grand Master |
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As we talked about, a number of changes were made to this. Here are the ones I can recall off the top of my head...
1. We made it a stereo amp, so the power transformer has better current rating to accomodate that (I'd suggest 100ma or so min, 150 better).
2. R8 change to 25w
3. C5 change to Solen 47uf, 250v
4. R2 & R4 are tantalum
5. Change SS diodes to a 5AR4 (you'll need a 5v, 3a winding on the PT to do this, but well worth it)
6. Change C1 to 20uf, Solen, 630v
7. We made a "dual mono" supply by adding a second choke after C1 and then an additional C2 for the second channel
8. Make R10 270k, 5W
9. C6 is 10uf Obligoto oil cap
10. Use a Hammond filiment tfr w/dual 2.5v, 2.5a secondaries for the two 45's.
By the way, with some minor changes, the iron and power supply will certianly support using 2A3's instead of 45. You'll need to change the cathode R on the output tube to do this. Also, remember, we're shooting for 10ma and 150v on the plate of the driver.
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