Filament supply modules.

If they glow, this is the place to be
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Mike H
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#241

Post by Mike H »

Does seem to work quite well though if you can put up with the heat :D
 
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pre65
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#242

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Mike H wrote:Does seem to work quite well though if you can put up with the heat :D

It works very well. :)

I shall be interested to hear about your new thoughts on this. :wink:
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Mike H
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#243

Post by Mike H »

Come to that, so would I! That makes 2 of us :lol:
 
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#244

Post by pre65 »

Mike H wrote:Come to that, so would I! That makes 2 of us :lol:
Perhaps a little "lubrication" at the seminar on Friday evening will help ? :)
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Mike H
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#245

Post by Mike H »

Lubrication always helps flights of fantasy :D
 
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#246

Post by Andrew »

Seems a 6.3v DC heater works better with a 7809 reg, Mike does this make sense?

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#247

Post by Andrew »

A measure of success :)

Mike's heater reg running off a DC PSU into two 8R2 wirewound resistors in parallel as a dummy load - close enough to a 300B for jazz....used the chassis as a heatsink. The 1R gets toasty and sweats a bit, I may just get a higher rated resistor as its eventually going in a case.

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#248

Post by Mike H »

My resistors are 2W 1% metal film. From Rapid IIRC.

Andrew wrote:Seems a 6.3v DC heater works better with a 7809 reg, Mike does this make sense?
Sorry pic too small to see the details :D

Guess it could, but don't forget the sense resistor drops 1.2V as well, leaving 1.5V across the CCS transistor.

Bear in mind mine is jacked up to 12V so can also run 801A @ 7.5V.

That would make 3.3V across the transistor. Having said that though I recently added 1R WW in series with the collectors, takes the heat off the trannies a bit.
 
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