SP 12 SE

[laatsch55]

I know potentiometer distortion is a very real phenomenon, but switch contacts?? Any thoughts folks??

 

[speakerman1]

Just woke up a little bit a go. Been thinking on the switch thing. Do you know of a 2 place selector switch like the input selector?

I just looked every where I knew to look. Nothing special.

Larry

 

[laatsch55]

So........you don't think I'm being anal???

 

[speakerman1]

LOL Yea a little. The mole may come out and bite you. LMBO

Larry

 

[laatsch55]

Your call.

 

[speakerman1]

Switch is ok. I mean I don't know of any thing else to do.

Larry

 

[laatsch55]

I e-mailed Joe. Leaving no switch unthrown.

 

[laatsch55]

here's another VERY TECHNICAL evaluation of switch construction, "If it feels good, use it" Thanks Joe!!

 

[laatsch55]

Now, Larrt, before you go to thinkin i didn't read every word and gaze at every pic of the construction on the tubes-for-hi-fi website, I DID. A LOT. Coukld not find an example of what to do with a pre-amp of this configuration. Evidently I'm supposed to know what I'm doin. Before proceeding further I need some preferences from YOU my friend.

#1-----With the Tape/In going to the selector switch instead of the Tape/Source switch, I'm not sure what you want to monitor on the Tape/Source switch. Most pre's will have a tape monitor switch to put Tape 1 or Tape 2 in line to hear, regardless of where the Source Selector switch is. The Tape/Out circuit is always on, depending on what source is selected, this signal is taken right after the Selector switch and before any tone, eq, buffer or other amp section( EXCLUDING the phono amp, phono signal input is too low for a tape out signal). Here is where my ignorance jumps to the fore, if we leave things like this and you have signal coming in on Tape/In from the selector switch and flip the Tape/Source switch to tape.....will there be instantaneous massive amounts of feedback????? I'm stuck here guy, for some reson can't wrap my head around this.

 

[speakerman1]

Hi
I sent Roy an email with your question. He built a new pre also SP14. I can't see a difference. I couldn't see from his pics where he is coming off for the switch. Rex his 1st build he used PIO.

Larry

 

[laatsch55]

Thanks .

 

[speakerman1]

Answer.

o answer your last question, YES, you can't have a tape input on the selector and have it on the tape output, or you'll get massive feedback.
That's why the separate TAPE-SOURCE switch. I always wire tape input to the TAPE-SOURCE switch, NOT to the selector switch.
I'm not sure what your particular case is, if you have a 2 separate tape inputs, then the output should go to a different recorder than the input that goes to the selector.

larry

 

[laatsch55]

That's what I thought. thank You very much Larrt.

 

[laatsch55]

Yo LaRRT??? Did youget any literature with the TKD pot??

 

[speakerman1]

No why? I sent every thing I had.

Larry

 

[speakerman1]

Yo LaRRT??? Did youget any literature with the TKD pot??

Email sent. LOL

Larry

No Larrt yet. Will be soon though. LMBO

 

[laatsch55]

Just not sure what tab to ground or if I need to ground it at all.

Painstaking progress. Point to point is tedious to get to look good. Some of those input pairs I cut, stripped and heatshrunk 4 times to get it where I liked it.,

 

[laatsch55]

the feel of the Goldpoint stuff is excellent, they just oooze quality.

 

[speakerman1]

Looks very nice. Thank you so much for doing this. You may get a man bearing gifts today. LOL

Larry

 

[speakerman1]

He has compared this Pre to a 3000.00 pre without my upgrades. The 14 is suppose to be like a 6000.00 pre.

Larry