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PostPosted: Tue Oct 15, 2019 8:21 am 
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Joined: Thu Feb 07, 2019 10:32 am
Posts: 9
Wired PT for both 240 & 230 V to test which way better voltages will be achieved. Here are the results with 233V Mains Voltage with NO LOAD

What do you think which result is better for operation under load?
Thank you


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PostPosted: Tue Oct 15, 2019 1:59 pm 
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Joined: Sat Dec 04, 2010 3:42 pm
Posts: 443
Location: Qualicum Beach, BC
The 230-volt readings look reasonable. You should check again once the tubes are installed to see which tap gets the heater voltages closest to 5 for the rectifier and 6.3 for the rest.


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PostPosted: Tue Oct 15, 2019 2:36 pm 
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mitch m wrote:
The 230-volt readings look reasonable. You should check again once the tubes are installed to see which tap gets the heater voltages closest to 5 for the rectifier and 6.3 for the rest.

Thank you Mitch!
But are you sure about 5V for the rectifier heater? Manual says 6.3V also


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PostPosted: Tue Oct 15, 2019 8:59 pm 
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Joined: Sat Dec 04, 2010 3:42 pm
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Location: Qualicum Beach, BC
You are right. EZ81 needs 6.3 volts on the heater. I was thinking of GZ34 or 5AR4. I should have looked at the schematic!


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PostPosted: Wed Oct 16, 2019 6:13 am 
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;)
mitch m wrote:
You are right. EZ81 needs 6.3 volts on the heater. I was thinking of GZ34 or 5AR4. I should have looked at the schematic!


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