On the power tubes, pin 8 ( and 1 on the SSE board ) are the cathode. You can check the cathode voltage at either pin.
The plate ( anode ) is at pin 3.
Subtract the cathode voltage from the plate voltage to get the actual voltage across the tube.
The plate ( anode ) is at pin 3.
Subtract the cathode voltage from the plate voltage to get the actual voltage across the tube.
Ok hooked up everything as pictured in Georges files for initial start up choke hooked up no cap yet( ready for later ) have 355 acvolts from psu, no freds and I have no volts going to rectifier tube from 355 ac heres a pic have 6 volts for heater , ???
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Ok hooked up everything as pictured in Georges files for initial start up choke hooked up no cap yet( ready for later ) have 355 acvolts from psu, no freds and I have no volts going to rectifier tube from 355 ac heres a pic have 6 volts for heater , ???
You have 355 ac volts from psu. Where did you measure this?
You have no volts going to rectifier tube from 355 ac. Where are you measuring no volts at the rectifier?
Have you installed a rectifier tube yet and measured B+ voltage?
Not sure what your "???" question is.
I tested at pin mount t1- red , and yes I did try B+ with 2 different rectifier tubes, checked all pins on tubes only have filament power 4.8volts. ??? are for the fact that I'm a noob and looking for suggestions, since I have reverse mount I'm thinking of pulling out of case and checking all values and components again.
There are two small diodes (1N4007 or UF4007) missing near the rectifier tube, D3 and D4. They were added to all SSE boards starting in 2012.
If you want to see it work a wire jumper can be used in place of each diode, but putting diodes there will make life easier for your rectifier tube.
If you want to see it work a wire jumper can be used in place of each diode, but putting diodes there will make life easier for your rectifier tube.
I'll get some coming and jumper to get my readings, Thanks this forum is the best especially Thanks to you George!
They are, but you must put a piece of wire in their place if you don't use them. You should be able to do that without taking the board out of the case.
I've decided to add pin jacks to my amp trying to decide if mounting is better in right side wood panel or in top aluminum behind board just in front of output transformer, what are peoples thoughts?
Okay Thank George diodes installed, B+ 440 with JJ GZ34(5ar4), with NOS GE 5U4GB - 415, with NOS Standard 5U4G - 411, with KT88 Genalex red lion have 140 mA, 138 plate volts pin 3 minus pin 8 almost exactly same Triode or UL, not liking cathode feed back. EL34 not as good sounding as KT88's after I get bottom on and feet I take more pics, and then I will hook up to my better speakers.
I'm back been running my amp with KT88's for a year just found a reference for these tubes that states they need to be at least 4" center to center, so I'm putting my EL34's in,