Filament supply modules.
- pre65
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#242
Mike H wrote:Does seem to work quite well though if you can put up with the heat
It works very well.
I shall be interested to hear about your new thoughts on this.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
- pre65
- Amstrad Tower of Power
- Posts: 21373
- Joined: Wed Aug 22, 2007 11:13 pm
- Location: North Essex/Suffolk border.
#244
Perhaps a little "lubrication" at the seminar on Friday evening will help ?Mike H wrote:Come to that, so would I! That makes 2 of us
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
#247
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.
Andrew
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.
Andrew
Analogue, the lost world that lies between 0 and 1.
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#248
My resistors are 2W 1% metal film. From Rapid IIRC.
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.
Sorry pic too small to see the detailsAndrew wrote:Seems a 6.3v DC heater works better with a 7809 reg, Mike does this make sense?
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.
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."