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cctsim
Silver Member
United Kingdom
418 Posts |
 Posted - 06/24/2009 : 02:05:10
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This mod decouples the mid and high gyrators inside the HM-2 tone stack. You'll need an extra 10k potentiometer. The outer lugs of the potentiometer are connected to 13 and 14, the middle lug is connected to the (-) side of C28 or alternatively C29. Obviously, you'll need to lift the (-) leg of the capacitor.
The mod gives more flexibility to the tone as you can adjust mid and high frequencies independently. However, if you move the knobs symmetrically you still get the original HM-2 tone.
I will post some photos soon.
Here is the schematic for the mod:
The mod gives more flexibility to the tone as you can adjust independently.
Photos:
Enjoy  and measure carefully before you drill. |
Edited by - cctsim on 10/31/2009 20:34:26 |
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
Posted - 06/24/2009 : 02:33:15
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Thats pretty cool, is there any resistance value that sounds best?
Wouldn't it be easier to add a resistor than add a extra pot?
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cctsim
Silver Member
United Kingdom
418 Posts |
Posted - 06/24/2009 : 03:58:03
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Well you can use a trim potentiometer and adjust it to the desired setting and then replace it with fixed resistors.
But its not the same flexibility as an external pot. |
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moonmarkcus
Silver Member
Nicaragua
224 Posts |
Posted - 06/25/2009 : 08:58:26
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THANK YOU !!!!
I was waiting for this mod...
I will to see your pictures soon... |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 10/31/2009 : 11:52:29
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RONanFEZ & Guys
I have revived this excellent older post by cctsim.
As RONanFEZ was recently asking for this mod,
but his post seems to have been deleted or it's gone MIA.
Thanks again to cctsim for sharing his mods & findings.
Regards Dr. Bob
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RONanFEZ
Bronze Member
USA
85 Posts |
Posted - 10/31/2009 : 13:05:24
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quote:
Originally posted by Dr. Bob
RONanFEZ & Guys
I have revived this excellent older post by cctsim.
As RONanFEZ was recently asking for this mod,
but his post seems to have been deleted or it's gone MIA.
Thanks again to cctsim for sharing his mods & findings.
Regards Dr. Bob
Thanks Dr Bob, I did post looking for this mod but then i found it. And removed the post thanks again  |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 10/31/2009 : 13:54:25
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Hi RONanFEZ
quote:
Thanks Dr Bob, I did post looking for this mod but then i found it. And removed the post thanks again
No problems RONanFEZ.
I'm sure other member/s will get some value out of this mod.
Regards Dr. Bob |
Edited by - Dr. Bob on 10/31/2009 13:55:26 |
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cctsim
Silver Member
United Kingdom
418 Posts |
Posted - 10/31/2009 : 14:41:59
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I will try to post the pictures for this mod tonight, it's very simple, but involves some drilling.
My HM2 was with a friend until recently that he wanted to tried it and "conveniently" always forgot to return it. |
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cctsim
Silver Member
United Kingdom
418 Posts |
Posted - 10/31/2009 : 20:33:14
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| Photos added. |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 11/01/2009 : 12:38:17
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Hi cctsim
Thanks for uploading pictures of your:
HM-2 Tome Stack Mod.
Regards Dr. Bob |
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Ptak
Bronze Member
141 Posts |
Posted - 11/03/2009 : 03:21:51
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| that looks awesome! haha beyond my level of soldering and electronic know-how tho :( |
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Topic |
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HM2 Tone Stack Mod
