| Sourcing parts [message #30126] |
Tue, 18 January 2005 19:45  |
colinhester
Messages: 1349
Registered: May 2009
Location: NE Arkansas
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Illuminati (3rd Degree) |
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Seems we're going "balls out" getting a custom wound trany. I was wanting to keep the project around $100, but WTF. What's the best part for each component? If we're goin' do it, let's do it right.....Colin
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| Sourcing parts [message #30128 is a reply to message #30127] |
Wed, 19 January 2005 07:20  |
PakProtector
Messages: 935
Registered: May 2009
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Illuminati (2nd Degree) |
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Hey-Hey!!!,
For output coupling caps, Allied Electronics 7.5 uF ASC motor run caps. less than 10 each, any voltage rating is OK, but I slightly prefer the 440vac. Seem to be a slight improvement, and higher voltage will improve their recycleability.Cascode the active loads. This is the single most important thing. One more mosfet and gate stopper each. Can't over-emphasize this one. Might be best to design to put it in later, just for effect. Battery bias on the CCS is an improvement as well, but is a bit more complex and perhaps can be done o a rev. 2 ( and more comfort has been achieved with the design ). I don't quite agree with the cheap leads to ForePlay. The original as drawn will do quite well( better I think by a mile, but that's opinion for the time being ). regards,
Douglas
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| Re: Sourcing parts [message #30133 is a reply to message #30131] |
Wed, 19 January 2005 09:44 |
PakProtector
Messages: 935
Registered: May 2009
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Illuminati (2nd Degree) |
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The big choke is PN HTS 8039. I don't see any reason not to do it this way. There were a few things which were specified at minimum price and complexity. Make sure you specify the type of endbells you want for the choke, I had a nice pair of vertical ones from my salvage bin and told them to put it together any way they wanted... The 'Swiss Army Knife' sort of Power Iron and the big choke will move things nicely up the performance ladder. In my book, $350-500 is a reasonable parts bill for a simple linestage. With labour and profit margins, a $350 parts bill would work out to something like a $4k linestage once it was properly dressed...
regards,
Douglas
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| most of it is... [message #30135 is a reply to message #30134] |
Wed, 19 January 2005 11:59 |
PakProtector
Messages: 935
Registered: May 2009
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Illuminati (2nd Degree) |
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There are a few changes. One being the rectifier. The new revision is a standard full wave. HV to the plates, ground the CT and continue as drawn. No SS required to assemble a full bridge. The choke is now changed to the big Heyboer 8039, but the 100 uF/370VAC from eBay's midorimeadows is not changed. probably best to run the 6CA4, though a pair of 6AX4 or 6W4 are also 'do-able' since we have 3A to cover the 2.4A required for using two damper diodes. Look at Bas Hornman's site on the active loads. I can't think of anything else of any importance.
regards,
Douglas
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