Bottlehead Forum

Bottlehead Kits => Stereomour II => Topic started by: lesouthern on April 04, 2021, 05:47:09 AM

Title: 4-pin socket placement, large and small holes [resolved]
Post by: lesouthern on April 04, 2021, 05:47:09 AM

Hi I'm having difficulty from the instructions (page 14) seeing the difference between the larger and smaller holes on the 4-pin tube sockets.
"The larger holes MUST face the back of the chassis"

Are these installed correctly? Any other indications I can see they are?

thanks,

Larry

Title: Re: 4-pin socket placement, large and small holes
Post by: Paul Birkeland on April 04, 2021, 05:48:48 AM

This is more easily seen from the top, could you post a couple of photos of the tops of the sockets with the hum pot shafts included for reference?

Thank you for stopping your build and coming here to seek help, it's a lot easier to get this ironed out now rather than after the amp is soldered up!

Title: Re: 4-pin socket placement, large and small holes
Post by: Deke609 on April 04, 2021, 06:14:37 AM

Another way of checking: turn the chassis right-side up in the base and insert the 2A3 tubes - the right way will be snug, but doable; the wrong way won't work unless you use way too much force to insert the pins. Once you figure out the right way, check whether the fat pair of pins are farthest from the front, and the skinnier pins closest to the front. If they are, the sockets are oriented correctly. If not, they need to be rotated 180 deg.

cheers, Derek

Title: Re: 4-pin socket placement, large and small holes
Post by: lesouthern on April 04, 2021, 06:24:47 AM

thank you, here are pictures of my current installation from top views, is this right?

Title: Re: 4-pin socket placement, large and small holes
Post by: Paul Birkeland on April 04, 2021, 06:40:01 AM

One is correct, one is backwards.  The ceramic wafer has enlarged holes for the larger pins, which aren't so hard to see from the top.

Title: Re: 4-pin socket placement, large and small holes
Post by: Doc B. on April 04, 2021, 06:40:51 AM

D socket is backwards. Rotate it 180 degrees.

Title: Re: 4-pin socket placement, large and small holes
Post by: lesouthern on April 04, 2021, 07:15:56 AM

Yes I see exactly what you are talking about now. Glad I could fix it at this phase.

Back to practicing soldering.

thanks for the help