Do any of you guys know much about BASH power supplies?...

Illusus · 3rd October 2004, 04:58 AM

...or where to find some info/help on the subject?

I was given a 'broken' Boston Acoustics PV800 sub, a guy I work with figured I could do something with it. It has a BASH amplifier, with power on the PS emits a high pitched buzz (like a camera flash cpacitor powering up). I checked every stage and tracked it down to the PS. There is one large cap in the PS, a 200V 680uf, that's domed a bit, I'll replace it. I don't know anything about this type of power supply and don't know if there are any common areas to check first. Suggestions?

brybo86 · 25th September 2008, 09:32 PM

i too got a broken pv800 from a friend, the bash amp appears to have been melted in a few spots? I was just wondering what you ended up doing with it?

Illusus · 25th September 2008, 10:03 PM

It ended up in the trash heap. I didn't get it to work.

They are pretty cheap online (can't remember where offhand(google) or you can buy a really nice plate amp from Steve at Apexjr.com at a great price.

Duo · 25th September 2008, 10:23 PM

I have a BASH here with a bad power supply. When I'm finished reverse-engineering it, I may be able to help.

ostripper · 26th September 2008, 02:52 AM

The bash is a commercial Switch mode power supply (SMPS)
device that runs it's amp class G (variable/dynamic voltage)
for more efficiency.

It seems this amp is not too well designed (no offense)
or they wouldn't be burning up so regularly.

I spent nearly 200$ just to get a REAL 250W DIY sub
amp which is almost as much as a new BASH.

The 620uf cap is most likely the line level reserve before
the switching FET's (same as a PC PS)you should
go to the "Class D" forum as some of the gentlemen
over there build their own SMPS's and would likely
'jump' at the chance to diagnose/comment on your BASH
problem....
OS

BTW, I do know how to repair SMPS's (car amps,PC, monitors)
but the guys over in the Class D forum are "gods".

3rd October 2004, 04:58 AM	#1
Illusus diyAudio Member Join Date: Sep 2002 Location: Prairie Wasteland, Canada	Do any of you guys know much about BASH power supplies?... ...or where to find some info/help on the subject? I was given a 'broken' Boston Acoustics PV800 sub, a guy I work with figured I could do something with it. It has a BASH amplifier, with power on the PS emits a high pitched buzz (like a camera flash cpacitor powering up). I checked every stage and tracked it down to the PS. There is one large cap in the PS, a 200V 680uf, that's domed a bit, I'll replace it. I don't know anything about this type of power supply and don't know if there are any common areas to check first. Suggestions? __________________ Fighting the program since 1976.

25th September 2008, 09:32 PM	#2
brybo86 diyAudio Member Join Date: Sep 2008	bash amplifier pv800 i too got a broken pv800 from a friend, the bash amp appears to have been melted in a few spots? I was just wondering what you ended up doing with it?

25th September 2008, 10:03 PM	#3
Illusus diyAudio Member Join Date: Sep 2002 Location: Prairie Wasteland, Canada	It ended up in the trash heap. I didn't get it to work. They are pretty cheap online (can't remember where offhand(google) or you can buy a really nice plate amp from Steve at Apexjr.com at a great price. __________________ Fighting the program since 1976.

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25th September 2008, 10:23 PM	#4
Duo diyAudio Member Join Date: Jun 2002 Location: Victoria, BC, Canada	I have a BASH here with a bad power supply. When I'm finished reverse-engineering it, I may be able to help.

26th September 2008, 02:52 AM	#5
ostripper diyAudio Member Join Date: May 2008 Location: Albany , NY (smallbany)	The bash is a commercial Switch mode power supply (SMPS) device that runs it's amp class G (variable/dynamic voltage) for more efficiency. It seems this amp is not too well designed (no offense) or they wouldn't be burning up so regularly. I spent nearly 200$ just to get a REAL 250W DIY sub amp which is almost as much as a new BASH. The 620uf cap is most likely the line level reserve before the switching FET's (same as a PC PS)you should go to the "Class D" forum as some of the gentlemen over there build their own SMPS's and would likely 'jump' at the chance to diagnose/comment on your BASH problem.... OS BTW, I do know how to repair SMPS's (car amps,PC, monitors) but the guys over in the Class D forum are "gods".

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