Technik > Tech-Talk Amps

Harley Benton GA5 Tube Town mod II - some questions

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Dirk:
Hi,

Pin 5 of which tube ?

Best regards, Dirk

larsthestrat:
hi dirk,

Thanks for helping me out once more, I think I understand better now, the two blues wires are coming from C12 (heater voltage), aren't they? Connected to pin 5 and 9 on the socket of the new tube.

pin 5 to the - of the heater and connecting pin 9 to the + of the heater? Is it correct what I say above?

nb. You mentioned I should solder pin 4 also to the + of the heater. This I should still do?

Then my final question is: there is also this (big) black wire that goes under the PCB (connecting some things on top of the new tube), where does it connect to under the PCB?

regards,

lars

Dirk:
Hi !

I am sorry Lars, but you better try to find a good tech otherwise you will kill the amp and / or yourself too !!!! Don't do this what you wrote.

Best regards, Dirk

larsthestrat:
Hi Dirk,

Thanks for your reply and for your worries. I'll think I manage and look out for myself. I've already started soldering it up. I know about filter drainage, etc.......

Is it true that these last two questions will sort things out? Or am I mistaken. Because those three wires (2 blues and one big black one coming from under the PCB) I cannot see clearly on the pics where they come from and go to. I think the big black one is the ground wire connected to rk1/rk2 and the two 470k on the new tube. Is this correct?

The two blue ones are coming from C12, one goes to pole 5 (+ as you mentioned) on the socket and one goes to.... (I think pole 9...)

I don't know any tech-guys.....

Dirk:
Hi,

don't build based upon the picture - take the schematic and read it ! This is importend and will not lead to mistakes, well, if you understand it. And evyrthing should be clear. As long as you don't understand this basics you should not touch the amp !

Best regards, Dirk

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