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Old 15th July 2005, 02:42 AM   #1
sklimek is offline sklimek  United States
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Default Help on 300B power supply...

I am getting ready to order two power transformers for my first 300B mono blocks. ElectraPrint has requested the volts and amps of each secondary winding. DuncanPSUD2 has supplied me with the information I need for the mains, but the question I have is for the current (amps) for the remaining secondaries. Please have mercy for these simple questions:

From the attachment:

The heater supply for the GZ37 is requiring 5V and 2.8 amps for the current taken from a fact sheet. Would it be correct to say – 5V/2.8 amp for this secondary?

This amplifier is a mu-stage with a 6AC7 – 6SL7 combo, both tube heaters requires 6.3V, 6AC7 needs .45 amps whereas 6SL7 needs .3 amps, O.K. to choose the higher value for both? It is also center tapped, how about – 6.3V/.45 amps - CT (?)

Last but not least the secondary for the 300B, it starts as a 6.3V and ends up after being rectified at 5V. How would I determine the amps needed here? The 300B calls for 5V/1.2 amps, sooooo - 6.3V/ (?) amps…

Stan
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