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Harley Benton GA5 Tube Town mod II - some questions

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larsthestrat:
I'm still working on the modding of the Harley Benton GA5. I swapped the output tranny for the hammond cse, and it works fine, so now I enter the walhalla of this modding project, the extra tube (mod II). I sincerely hope you'll help me out once more with some things. I managed to figure out most of the soldering bij looking at the scheme and pics, but I do have some questions (I don't want to blow things up now) ad not very technical:
- Anode is this the little red wire and conncected to C8?. Do I have to attach this to the - or + at the capacitor?
- Heater voltage is this the big black wire connected to C12?. Do I have to attach this to the - or + at the capacitor?
- I think I see 2 ground wires (blue ones). Is this correct?
- One of the blue ones is connected to pole 5 at the socket, is this corrrect?
- Where is the other one connected to?
- Are the poles 4, 5 (ground?) and 9 not used at the socket? I don't see anything in your schematic?
- Anode is the - symbol in your schematic?
- Heater voltage is the © symbol in your schematic?

the rest I figured out, I do have all the materials, only these questions before I can begin.....
You would help me out big time!

Dirk:
Hi,

the Anode needs positiv power and this comes from the positive side of the capacitor.
The heater needs to connection. One from the + and one from the -.
Just check out http://www.tube-town.net/info/datenblaetter/tubes/jj/jj12ax7.pdf there you can see which pins are used for the heater.
If you are using 12,6 V for the heater Pin 9 is not connected and if you ar eusing 6,3 V both heaters must be used parallel.

Best regards, Dirk

larsthestrat:
thanks! I must be bugging you.........

so the little red one is the anode? the big black one is the heater?

I want to perform the same mod you did, that means I have to do what?

- positieve side of the heater voltage goes to pole .... of the socket

- negative side of the heater goes to pole .... of the socket

I don't understand the pdf file.

And what about the ground wires (are there two? and to which poles are they connected)

regards lars

Dirk:

--- Zitat von: larsthestrat am 31.01.2009 12:06 ---- positieve side of the heater voltage goes to pole .... of the socket
- negative side of the heater goes to pole .... of the socket

--- Ende Zitat ---

It is regardless. Connect the + to Pin 4 and the - to Pin 5 and try to find somebody how knows a little bit more about this stuff and who can check your amp before your power it on. It is the savest way !



--- Zitat von: larsthestrat am 31.01.2009 12:06 ---And what about the ground wires (are there two? and to which poles are they connected)

--- Ende Zitat ---

Which ground wires ?

Best regards, Dirk

larsthestrat:
Thanks for your reply.

I do see some blue wires (two?) I thought those were the ground wires and one is connected to pole 5 on the socket. the other one I cannot see it going on....

grt. Lars

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