The two heater windings are separate!!!
With this one still too hot. http://es.farnell.com/webapp/wcs/stores/servlet/ProductDisplay?catalogId=10001&langId=-5&urlRequestType=Base&partNumber=1319812&storeId=10176
What thermal resistance is necessary?
Because they both now see the HV voltage divider heater lift. Put bigger sinks...
With this one still too hot. http://es.farnell.com/webapp/wcs/stores/servlet/ProductDisplay?catalogId=10001&langId=-5&urlRequestType=Base&partNumber=1319812&storeId=10176
What thermal resistance is necessary?
The tx have two secondaries more of 5,2V AC 3 A each so can reach together 11,8V AC?
I left the Lundahl heaters or I come back to the two 12V 3A?
The two heater windings are separate!!!
You planned to first try put two windings in series to make a higher one I thought.
Vin 12,49 & 12,63VDC
What thermal resistance is necessary?
That one is the tallest sink of that series and it should do a good enough job when you need to replace a smaller one for 1-2W more demand on the same footprint. Each of your regs dissipates around 6W with that Vin and the two units two types tubes heaters as load. That sink says 4.5C/W but derate 30% for spot heating and it would be 6C/W ιn perfectly open surrounding to rise 36C above ambient. 3C/W after derating would have been more optimal.
You planned to first try put two windings in series to make a higher one I thought.
Yes now 2 windings in series using only 1 Lundhal tx for heaters.
Another way would have been to share some heat on a CRC or RC fat 15W resistor dropping Vin to 9V DC and keep those sinks.
Very good idea, did you calculate the value?
- Home
- Source & Line
- Analogue Source
- Valve Itch phono