Harpo

Re: G-PULTEC problems, please help!
« Reply #740 on: May 26, 2019, 12:45:34 PM »
...but the pcb layout is differing from schematic and has the throw connections just the other way round, IE you'd have to join 2 with 3, 5 with 6, 7 with 8 and 10 with 11, else you'd be partly shorting out an inductor winding section. As this mixup in your case only would give a different frequency response, the error must be in a different spot. Something like a broken pcb trace, a broken, wrong connected or wrong value Hi-boost Q pot, ...
good luck
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 #741 on: May 26, 2019, 02:48:55 PM »
hm i would be happy if i got a changing frequency response at all. i already replaced the q pot and high boost and cut potentiometers. no change.

weiss

Re: G-PULTEC problems, please help!
« Reply #742 on: May 29, 2019, 12:32:12 PM »
found the problem after reading this post......


Problem solved!

I found out while remeasuring everything, that the 1M resistor above the bypass switch was giving me 1M at both positions of the bypass switch while that should have been bypassed.

So it was a bad connection in the bypass switch after all, but i didn't think of that before because the lo freq circuit was bypassed all right by that same switch!

:D!


i somehow... didn't wire the bypass switch  ::)

gyraf

Re: G-PULTEC problems, please help!
« Reply #743 on: November 28, 2019, 02:25:01 AM »
..added filter function description to my post on the first page..

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

snaper

Re: G-PULTEC problems, please help!
« Reply #744 on: January 12, 2020, 01:28:09 AM »
Hi Guys,

Finally, I decided to go with the tube stage.
Right now, I'm using it with a custom, opamp based gain stage, but it is way to "clear".
I've ordered the missing parts and I'll etch the PCB next week, till that, I have two silly questions :

- I'd like to go with a transformerless version, I don't need them. Can I then omit the 2,2k resistors and can I route the signal with a jumper cable, like in the attached picture?

- I've ordered the custom GPultec power transformer from Don-Audio, is my connection correct?

snaper

Re: G-PULTEC problems, please help!
« Reply #745 on: January 14, 2020, 10:11:57 AM »
Could somebody? I've may posted this to the wrong thread?

iprovlek

Re: G-PULTEC problems, please help!
« Reply #746 on: January 14, 2020, 12:06:27 PM »
Snaper your connect with power transformer is ok!

You can omit 2k2 and take point from 4u7 cap and pin from GND to your output transformer!!!


iprovlek

Re: G-PULTEC problems, please help!
« Reply #747 on: January 14, 2020, 12:09:15 PM »
From Don Audio site...

iprovlek

Re: G-PULTEC problems, please help!
« Reply #748 on: January 14, 2020, 12:09:46 PM »
...

snaper

Re: G-PULTEC problems, please help!
« Reply #749 on: January 14, 2020, 01:43:31 PM »
Thanks!
Go Croatia! (Greetings from Hungary!)


iprovlek

Re: G-PULTEC problems, please help!
« Reply #750 on: January 15, 2020, 03:23:39 AM »
No problems Snaper....enjoy in your Pultec!

Im doing right now mine to and get power trannie from Don....



 

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