weiss

Re: G-PULTEC problems, please help!
« Reply #720 on: February 05, 2019, 05:28:49 AM »
If i want to transform potentiometers of a dual mono pultec into stepped switches, is it as easy as using the 1x12 lorlins, adding resistors to it (like in the pqd2) and connect it?

i found these pcb's: http://diy-tubes.com/index.php?route=product/product&path=59&product_id=167

might that work?

thanks


gyraf

Re: G-PULTEC problems, please help!
« Reply #721 on: February 06, 2019, 05:55:13 AM »
I don't see why not? But you don't actually need pcb's for that, do you?

Jakob E.
..note to self: don't let Harman run your company..

weiss

Re: G-PULTEC problems, please help!
« Reply #722 on: February 06, 2019, 06:13:39 AM »
I don't see why not? But you don't actually need pcb's for that, do you?

Jakob E.

thanks, yes not really  ::)

petermontg

Re: G-PULTEC problems, please help!
« Reply #723 on: February 06, 2019, 11:07:38 AM »
Is it possible to control the iput in the amp.

And if so where about would i

Best
Peter

gyraf

Re: G-PULTEC problems, please help!
« Reply #724 on: February 08, 2019, 01:00:32 AM »
say again?
..note to self: don't let Harman run your company..

weiss

Re: G-PULTEC problems, please help!
« Reply #725 on: February 08, 2019, 05:12:20 AM »
Is it possible to control the iput in the amp.

And if so where about would i

Best
Peter

you want to control intput or output gain?

Re: G-PULTEC problems, please help!
« Reply #726 on: March 23, 2019, 09:43:26 PM »
Hi all,

Can someone tell me what the resistor values on the Don Audio filter board are? On the original they're marked as 1k, 1k, 10k, and 75r, is that right? If so, what do they correspond to, R1, R2 etc. Cant seem to find this anywhere online.

Probably a bit late but for anyone else needing them they are:

R1 = 75R
R2 = blank
R3 = 10K
R4 = 10K

petermontg

Re: G-PULTEC problems, please help!
« Reply #727 on: April 17, 2019, 02:41:57 PM »
you want to control intput or output gain?

What I am trying to do is just to control the input into the SRPP.

Any Ideas wold be great.

Best
Peter

weiss

Re: G-PULTEC problems, please help!
« Reply #728 on: April 17, 2019, 04:15:41 PM »
What I am trying to do is just to control the input into the SRPP.

Any Ideas wold be great.

Best
Peter

You could replace the 10k resistor in front of the SRPP (between filter pcb in and ground next to 220n coupling cap to ground) with a potentiometer to attenuate the signal.

petermontg

Re: G-PULTEC problems, please help!
« Reply #729 on: April 19, 2019, 08:37:19 AM »
Thanks I'll give it a go over the weekend.

Best
Peter


weiss

Re: G-PULTEC problems, please help!
« Reply #730 on: May 23, 2019, 07:17:52 PM »
Hey guys,

i built a pultec with stereo potentiometers and dual gang switches from a kit i bought off a member here. But the high section (boost & attenuation) doesn't do anything on both channels..
Low section works as expected. i checked the wiring and couldn't find any loose connections.
Could you give me a hint where to look ?
Otherwise this eq is working fine.

thanks
Ansgar

gyraf

Re: G-PULTEC problems, please help!
« Reply #731 on: May 24, 2019, 06:28:27 AM »
High boost and high cut are two entirely different functions, so it's probably more that one error. Maybe switch miswireing?

Jakob E.
..note to self: don't let Harman run your company..

weiss

Re: G-PULTEC problems, please help!
« Reply #732 on: May 24, 2019, 07:03:54 AM »
High boost and high cut are two entirely different functions, so it's probably more that one error. Maybe switch miswireing?

Jakob E.

Oh okay! alright, i'll check.

thanks for the persistent help  :)

weiss

Re: G-PULTEC problems, please help!
« Reply #733 on: May 24, 2019, 01:01:21 PM »
High boost and high cut are two entirely different functions, so it's probably more that one error. Maybe switch miswireing?

Jakob E.

Now i completely rewired the 3 switches, replaced the 4 filter boards but nothing changed  :-[
I am not using lorlin switches mounted on the pcb but these front panel mounted dual gang switches:


I put the marked with 1 as the first position of each switch, that should be correct - or not?
Does the  high freq selection switch need connection from the poles to the pcb? It seems they are only connected to each other.
« Last Edit: May 24, 2019, 01:20:15 PM by weiss »

weiss

Re: G-PULTEC problems, please help!
« Reply #734 on: May 25, 2019, 09:55:01 AM »
i am absolutely confused where this might come from. i used two completely different filter boards and wired all switches from the beginning but still the high section doesn't do anything...   :-[
Is there someone who might have experienced the same?
I am clueless  :-\

weiss

Re: G-PULTEC problems, please help!
« Reply #735 on: May 25, 2019, 10:41:47 AM »
not sure if this helps..


Harpo

Re: G-PULTEC problems, please help!
« Reply #736 on: May 26, 2019, 03:51:23 AM »
Ansgar, is this a dual 2x6 rotary switch for sure (4 pole connections) ?
As you didn't fit all wire connections where the joins were made on pcb, you did all (5 per side, 10 for stereo) corresponding joins at the switches poles and throws directly ?
A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.  -Douglas Adams

weiss

Re: G-PULTEC problems, please help!
« Reply #737 on: May 26, 2019, 05:43:49 AM »
Ansgar, is this a dual 2x6 rotary switch for sure (4 pole connections) ?
As you didn't fit all wire connections where the joins were made on pcb, you did all (5 per side, 10 for stereo) corresponding joins at the switches poles and throws directly ?

hey, yes it has 2 poles per channel so 4 in total and 6 positions.
I made all the connections which are needed on the pcb. when no lead was going from the switch on the pcb then i didn't wire it. hope this makes sense..

Like said there is no problem at all with the low section, this is what makes me wonder :-/

Harpo

Re: G-PULTEC problems, please help!
« Reply #738 on: May 26, 2019, 09:51:17 AM »
For Hi-boost frequency selection, deck 1, pole A and throw 1...6, pole B and throw 7...12. Deck 2 hooked up the same.
You joined throw 1 with 2, 4 with 5, 8 with 9 and 11 with 12 and you joined pole A with pole B ?
(hookup of low section and Hi-cut is different from Hi-boost)
A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.  -Douglas Adams

weiss

Re: G-PULTEC problems, please help!
« Reply #739 on: May 26, 2019, 10:29:14 AM »
For Hi-boost frequency selection, deck 1, pole A and throw 1...6, pole B and throw 7...12. Deck 2 hooked up the same.
You joined throw 1 with 2, 4 with 5, 8 with 9 and 11 with 12 and you joined pole A with pole B ?
(hookup of low section and Hi-cut is different from Hi-boost)

yep, exactly what i did


 

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