Ampeg B-15S response switch wiring please help.

[jatchley]

Oh there’s a 6.8uf tantalum cap in here as well. I left it for now but ive got my eye on swapping that out as well.

[vintagekiki]

You actually make the B-15S new.
It's a big job, and it's a big school.
Congratulation and welcome to the club.

When restoring the old timer, all the electrolytics, all plate resistors, and all power resistors (> 2W) must be replaced.
It's good that you replaced the cap in bias C26 (.047u) just check that it is mandatory for 600V.
After installed the 3 prong AC cord, remove the wiring for the A.C. outlet, polarity SW4 and C32 (.047u).
For SW1, traders say it's a rotary switch 6 pole in 3 position. Most likely you will not have to change it because it is solid state (closed) type, and it does not break the voltage.
Problem SW1 leave for the end when the whole B-15S is put in order and plays.

[g1]

Now that I know how the switch is divided I’ll be grouping the leads according to the 1pin - 3 pin spacing (groups of 4) and going over my continuity test and switch drawing to figure out what’s (B,F, or G) I’m still trying to figure how to tell a common apart from the others.

For each group of 4, there will be one particular pin that always connects (around 0 ohms) to another pin of the group in each of the 3 switch positions. That is your 'common' pin.
So find a pair of contacts connected, set the switch to another position and find another pair (of same group) connected. One of the pins will be 'common' to both settings. Verify with the switch in the third position.

[jatchley]

I figured it out. I kept forgetting “the path of least resistance” and the parallel stuff confused me. I see it now. The guy from vintage blue was right about the internal structure.

this forum says I exceeded a user group limit by however many MB so I can’t upload pics here.
I posted the pics on the other thread here.

https://el34world.com/Forum/index.php?topic=27666.0

[vintagekiki]

Again, the response switch is ok.
Eventually, it should be treated lightly with isopropyl alcohol and (or) quality contact spray (you have small holes on the back plastic).
For rare replacement parts it is worth contacting Ampeg Service Centers directly

https://ampeg.com/scl/

https://ampeg.com/support/

PS
As a last resort, if the response switch wiring is a problem, look at fellow musicians, maybe the correct Ampeg B-15S can be found, so take a detailed photos response switch wiring.

[jatchley]

That’s what I’m saying I solved the wiring of the switch. Once you break the switch into 8 3 way sections (4 lug 3pos 1 common each). It’s pretty straight forward.

[vintagekiki]

http://rutubes.com/product/rotary-switch-6pole-3position/

https://www.justdial.com/6-Pole-3-Position-Dual-Decks-24-Terminal-Band-Channel-Rotary-Switch-Selector/pid-158312405


https://www.walmart.com/ip/6P3T-6-Pole-3-Throw-2-Deck-Band-Channel-Rotary-Switch-Selector-Knob/621893224

[jatchley]

The switch has 16 connections per deck. 32 total. Not 24.

[vintagekiki]

The switch has 16 connections per deck. 32 total. Not 24.

- Ampeg B15S response switch has 20 total connections (5 pole in 3 position)

- The switch you mention has 16 connections per deck or 32 total connections (8 pole in 3 position).
3 not used (3 pole in 3 position)

- Post #38 has 12 connections per deck or 24 total connections (6 pole in 3 position).
1 not used (1 pole in 3 position)