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AI Modulus M3a Gain Switch, and Cap bypass switch ??

172.9.116.164

Posted on December 23, 2016 at 14:32:17
Ross
Audiophile

Posts: 1268
Joined: January 24, 2000
I just picked up and M3a.

I can not find the Hi/Lo gain switch or the Cap Bypass switch.

Where are the switches located on the circuit board ?

Thanks,

Ross

 

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You need the owners manual, posted on December 24, 2016 at 05:36:44
Awe-d-o-file
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Posts: 16762
Location: 100 miles west of DC
Joined: January 10, 2004
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October 31, 2005



But I don't understand you not finding them, they are right next to the line stage tubes the logical place they would be. I guess you are looking for a slide switch but they are DIP switches. Join hi-fi engine and download the manual free. All is explained. Manual good. Google is friend.


ET

"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936

 

"Manual good. Google is friend.", posted on December 24, 2016 at 13:20:31
1973shovel
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Location: Greenville SC
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  Since:
June 17, 2009


Excellent advice and mighty straight shootin' there, Tonto!


 

Some are different, posted on December 24, 2016 at 15:06:18
kavakidd
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April 21, 2004
mine only have two switches each. Bypass but no gain - sadly
"Man is the only animal that blushes - or needs to" Mark Twain

 

A 3A?, posted on December 24, 2016 at 16:20:13
Awe-d-o-file
Manufacturer

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Location: 100 miles west of DC
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Must have been an early run. Dip switch right? Gain and cap bypass all in the same DIP.


ET

"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936

 

RE: "Manual good. Google is friend.", posted on December 24, 2016 at 16:21:14
Awe-d-o-file
Manufacturer

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Location: 100 miles west of DC
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Thank you Mr Silverheels! Have em Merry Christmas


ET

"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936

 

Found them--Thanks- but, posted on December 24, 2016 at 18:04:57
Ross
Audiophile

Posts: 1268
Joined: January 24, 2000
I have 4 dip switches, 2 per side, with 2 positions for each switch. All switches are labeled on-off for hi-lo gain. Appears I do not have cap bypass switches. In addition, I do not have ceramic tube sockets.

My switches are located just to the right of center, towards the back of the circuit board. They are small, and were more visible in stronger light...

At hi gain, acceptable volume is about 12:00. There is a significant gain difference between the M3 and M3A. Listening level in my M3 is about 9:30-10:00.

Thanks,

Ross

 

YUP, posted on December 24, 2016 at 22:49:39
kavakidd
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And it shows in the manual - 2004- not "that" early is it?
"Man is the only animal that blushes - or needs to" Mark Twain

 

RE: Found them--Thanks- but, posted on December 25, 2016 at 05:37:14
Awe-d-o-file
Manufacturer

Posts: 16762
Location: 100 miles west of DC
Joined: January 10, 2004
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Sorry. A call or email to AI is in order then. Lots of good info on their site too. I would prefer the gain settings where 12 oclock was good over 9. Good FAQs on AI'sa page regarding lots of stuff. Good luck.


ET

"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936

 

RE: YUP, posted on December 25, 2016 at 05:39:02
Awe-d-o-file
Manufacturer

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Location: 100 miles west of DC
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No they started making that in about 96 I think. Based on the OP's reply and yours it seems things were variable......


ET

"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936

 

Silver Heels sound better , posted on December 25, 2016 at 05:47:24
1973shovel
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It's a well known fact.

They also serve to better ground you in the event you're foolish enough to float your equipment's ground. [nudge nudge, wink wink]

You have em Merry Christmas too, Kemosabe!


 

I know that but the date, posted on December 25, 2016 at 10:47:39
kavakidd
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"2004" is printed on a tag inside
"Man is the only animal that blushes - or needs to" Mark Twain

 

RE: Silver Heels sound better , posted on December 25, 2016 at 15:27:51
Awe-d-o-file
Manufacturer

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Location: 100 miles west of DC
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I float all 5 of my ham shack antennas. Ayres Hansen said safety ground is a noise antenna. McGowan of PS audio told me to lift the P-300 safety ground. Big improvement.


ET

"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936

 

RE: I know that but the date, posted on December 25, 2016 at 20:24:22
Awe-d-o-file
Manufacturer

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Location: 100 miles west of DC
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yes i saw you said that. i guess they made unpublished changes. did you buy it new or might it have been modded before you got it?




ET

"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936

 

Bought used but, posted on December 25, 2016 at 23:25:29
kavakidd
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Location: Upstate NY
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April 21, 2004
but no indication that it had been modded - would make no sense either.Replaced a 3 bought new
"Man is the only animal that blushes - or needs to" Mark Twain

 

RE: AI Modulus M3a Gain Switch, and Cap bypass switch ??, posted on January 3, 2017 at 10:50:00
wheezer
Audiophile

Posts: 4060
Joined: January 24, 2001
The M3 has Bourns conductive plastic attenuators. M3A has Elma stepped attenuators.
The two pots track differently.

 

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