Question about Low Impedence Filters on a Bogen PA Head Need Info.

Gunny · 18th July 2008, 09:56 PM

OK I was told by some one who I got that Bogen MX60 from that IF I take out the Low impedence filter that plugs in for each mic input it will change the circuit from Low Impedence to High Impedence. True or False? I do not want to unplug one of those filters and find out it will cause issues with the amp. Three of the filters look like short metal tubes that are rounded on top the other looks like a metal cap can. If this was the case then I could hook up a quarter inch jack for a guitar input with out getting a low to high impedence adapter and a female to female plug to hook it all up since Bogen had the brainstorm of using a male 3 prong input instead of a female one.

Gunny · 19th July 2008, 12:57 AM

I made a mistake they are low impedence transformers not filters.

Tom Bavis · 19th July 2008, 01:25 AM

You need to replace the transformer with a jumper plug for high impedance. I don't have the MX-60 schematic, but I assume its the same transformers as the MX-30. You need a 9 pin octal plug and it has pins 2-5 and 8-9 are jumpered together.

Gunny · 19th July 2008, 01:54 AM

Tom, Thanks for the info. I never seen a 9 pin octal size base before so what were they used for besides these transformers?

mashaffer · 19th July 2008, 02:01 AM

Quote:

I never seen a 9 pin octal size base before so what were they used for besides these transformers?

Pedal board connectors in Wurlitzer 4500 electronic organs. Do I win the useless trivia prize?

Tom Bavis · 19th July 2008, 02:05 AM

I probably have a few of those plugs - email tbavis(at)rochester(dot)rr(dot)com

Gunny · 19th July 2008, 04:04 AM

Email sent Tom.

mashaffer I would have never known that.

Gunny · 19th July 2008, 04:59 AM

Speaking of the transformer cans is there a trick to removing them? They seem sort of solid yet I know they are supposed to come out.

Gunny · 19th July 2008, 04:04 PM

Never mind on the pulling the transformer can out It came out it just took a bit more pull than a normal tube does.

18th July 2008, 09:56 PM	#1
Gunny diyAudio Member Join Date: Jan 2006 Location: WI	Question about Low Impedence Filters on a Bogen PA Head Need Info. OK I was told by some one who I got that Bogen MX60 from that IF I take out the Low impedence filter that plugs in for each mic input it will change the circuit from Low Impedence to High Impedence. True or False? I do not want to unplug one of those filters and find out it will cause issues with the amp. Three of the filters look like short metal tubes that are rounded on top the other looks like a metal cap can. If this was the case then I could hook up a quarter inch jack for a guitar input with out getting a low to high impedence adapter and a female to female plug to hook it all up since Bogen had the brainstorm of using a male 3 prong input instead of a female one.

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19th July 2008, 12:57 AM	#2
Gunny diyAudio Member Join Date: Jan 2006 Location: WI	I made a mistake they are low impedence transformers not filters.

19th July 2008, 01:25 AM	#3
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	You need to replace the transformer with a jumper plug for high impedance. I don't have the MX-60 schematic, but I assume its the same transformers as the MX-30. You need a 9 pin octal plug and it has pins 2-5 and 8-9 are jumpered together.

19th July 2008, 01:54 AM	#4
Gunny diyAudio Member Join Date: Jan 2006 Location: WI	Tom, Thanks for the info. I never seen a 9 pin octal size base before so what were they used for besides these transformers?

19th July 2008, 02:05 AM	#6
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	I probably have a few of those plugs - email tbavis(at)rochester(dot)rr(dot)com

19th July 2008, 04:04 AM	#7
Gunny diyAudio Member Join Date: Jan 2006 Location: WI	Email sent Tom. mashaffer I would have never known that.

19th July 2008, 04:59 AM	#8
Gunny diyAudio Member Join Date: Jan 2006 Location: WI	Speaking of the transformer cans is there a trick to removing them? They seem sort of solid yet I know they are supposed to come out.

19th July 2008, 04:04 PM	#9
Gunny diyAudio Member Join Date: Jan 2006 Location: WI	Never mind on the pulling the transformer can out It came out it just took a bit more pull than a normal tube does.

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