Strange Wiring in Bogen 6v6 PP - diyAudio
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Old 2nd February 2005, 03:46 PM   #1
zxx123 is offline zxx123  United States
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Default Strange Wiring in Bogen 6v6 PP

1. Signal wire go to not no.5 but to no. 6.
Then, it goes thru a resistor to no.5.
Why?

(green one is coupling cap.)

2. I am going to change two big aluminum
capacitors in PSU. However, I cannot understand
their wiring. What kind of capacitors is this?
how can I replace it?
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Old 2nd February 2005, 04:51 PM   #2
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1) I assume that it is the same amp in the post that was on the U/L question. Can you post a full schematic. My guess is that it is a grid bias R, in some fashion.

2) These are multi-section caps. One pin is for ground. and then the others are the + side of the cap. Usually there is a marking on the side of the cap that will indicate a color or symbol code to what terminal is to what section.

Does anyone know if there is a standard system to identify these guys, if that is not present?

Hope it helps

Matt
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Old 2nd February 2005, 05:07 PM   #3
zxx123 is offline zxx123  United States
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Default nop

thanks...

But it is different project.
This 6v6pp was made by Bogen, however, the 6v6SE
mentioned yesterday was made by myself.

I cannot find Bogen's original file schematic
in internet. I think it is almost the same as that
time's receiver such as H&K, Dynaco, etc.

Bass,Treble, Balance, Stereo-Mono, & Speaker-Headphone
switches are found. It uses P-K PI circuit. I am going to make
the circuit simple and replace rugged parts.

Anyway, i will upload some pictures of this Bogen
here and full schematic of 6v6SE in the 6V6SE
post.
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Old 2nd February 2005, 05:17 PM   #4
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I see the 6v6'pp' now.

I can read. Really

I will see if I can dig up a schematic then for the Bogen. Then we can tell if that wiring in the socket is true or a mod.

Matt
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Old 2nd February 2005, 05:33 PM   #5
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The resistor from pin 5 to 6 is probably a grid stopper. Usually if it were say, a grid leak, it would go from pin 5 to chassis (a tab off the socket's mounting saddle).

The capacitors are usually stamped on the outside as to the ratings. A geometric symbol accompanies the ratings, and these are stamped on the bottom of the can. The case is common and grounded by the chassis; I've never seen a twist-lock that has a seperate ground pin.

Tim
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Old 2nd February 2005, 05:47 PM   #6
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Tim,

that is good info on the caps. I havn't used the twist locks much. So that is good to know.

as to the grid resistor, I guess I am not getting why it would be across the cathode to the grid, with the full signal coming into the cathode. The stoppers that I have seen, have just been in series with the signal, attached directly to the grid pin on the socket.

I am sure that I am not getting something, please explain

TIA

Matt
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Old 2nd February 2005, 06:05 PM   #7
zxx123 is offline zxx123  United States
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Default Thanks..

Thank you for infos......really thanks..

1.
how many capacitors are needed if i replace them of new ones?

1. from rectifier / to opt
2. to screen grid of 6v6
3/4/5. to 12ax7/6eu7
6. ground

(green line in picture means connection. coil shape means resistor. )


2. Tim! why no.6 is used? I hear that it is critical in making noise even if it is it is blocked inside tube.
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Old 2nd February 2005, 06:14 PM   #8
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Do you have a model number for the amp?

Matt
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Old 2nd February 2005, 06:15 PM   #9
zxx123 is offline zxx123  United States
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Default model no. is

Bogen AP35.
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Old 2nd February 2005, 06:35 PM   #10
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Tried to look up a schematic. no luck.

For the caps, the easiest way is to just get some new twist lock cans. There are some decent ones out there. I would start at antique electronics supply. http://www.tubesandmore.com
You could replace them with discrete caps if that is what you want. Although I can't be certain, it looks as if the cap on the bottom of the picture has each of two sections paralled. if that is the case, you could replace them with one cap of their combined value. This was a common practice when using multi-caps to get the values needed.

Matt
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