| Forum: Dave Hecht - Master Tech |
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| Topic: Polytone Mini-Brute III Bass amp - Anyone got a schematic? |
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| Polytone Mini-Brute III Bass amp - Anyone got a schematic? [message #341094] |
Tue, 13 May 2008 17:20 |
 JGreenslade
Messages: 758
Registered: April 2004
Location: UK |
Gold Member |
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Hi,
I have what I believe is a 1st edition Mini-Brute III bass amp (velvet cloth - 15" speaker). The power amp section smokes... It literally makes the LM391N-100 explode into flames when powering up... The preamp section is fine. I have tested all transistors with my tester and they're fine... I have replaced all the electrolytics, bar the main filter pair.
I cannot find a schematic anywhere online. One firm claim to have it, but there are many versions of Mini-Brute and this firm wants $20 USD (if it's the wrong one, it's money down the pan - not to mention that firms who charge for schematics are on morally-dodgy ground when you consider they didn't design the effing thing!).
I could trace out the power amp, but it will be time-consuming and - from what I can gather - a working amp is only worth about $300 USD max, so it's hardly worth spending all the time on.
If I can't get a schem, I may well just disconnect the amp and put it on Ebay as a "bass cab" with a £1 starter price.
Many thanks in advance,
Justin
Audio is a vocational affliction
"there is no "homeopathic" effect in bits and bytes." - HansP
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| Topic: Otari MX5050 Counter Roller Removal |
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| Otari MX5050 Counter Roller Removal [message #339018] |
Mon, 05 May 2008 06:42 |
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oldsoulsound
Messages: 1
Registered: November 2007
Location: Glen Cove, NY |
Welcome |
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I need to send my counter roller out for re-furbishing but don't know how to remove it. Anyone have any experience with this?
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| Topic: AMPEX TU-40 |
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| AMPEX TU-40 [message #336307] |
Thu, 24 April 2008 15:08 |
mg73
Messages: 9
Registered: November 2007 |
Member |
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Hi
Just got a Ampex TU40 that is blowing fuses.
Anyone have some info or schematic on this WOW/flutter meter.
Thanks
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| Topic: Siemens Sitral C3 console schematics |
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| Siemens Sitral C3 console schematics [message #330553] |
Fri, 04 April 2008 08:45 |
isophase
Messages: 2
Registered: November 2006
Location: france |
Welcome |
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hello,
i'm looking for the schematics of a Siemens Sitral C3 console (10 mono 10 stereo 8 buss).
i have been looking around for a while now with no results.
the mixer needs a little work and i am not capable of figuring out the whole thing by myself.
any help would be greatly apreciated.
someone told me the siemens company kept some "microfilm" of all their product with the schematics, any idea where i could find them ?
does anyone know what happened to the WSW company in austria ?
does anyone have a contact number or email ?
thank you for your help
Jonahan,
jonreig@hotmail.com
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| Topic: MCI JH-636 > JH-50 problem |
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| MCI JH-636 > JH-50 problem [message #319417] |
Wed, 27 February 2008 11:50 |
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Mario I.
Messages: 513
Registered: July 2005
Location: Montreal |
Gold Member |
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Hi all,
Voltage problem with JH-50 cards.
Motherboards - (3) for faders (16channel each) plus 1 Master
2 of the fader boards are putting out the wrong control voltage to the fader packs.
When fader is down, the voltage reads -11 volts, when fader is full up it should read 0 volts, but instead the 2 faulty boards are reading about -5 volts, and therefore the sound out of those channels is very low...
I looked at the motherboards, noted all the chips and thinking about a total rebuild.
But in the meantime is there any 1 or 2 chips in particular that I could change to get this working right away?
Any help would be appreciated.
Thanks.
Mario
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| Topic: Metcal tip replacement |
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| Metcal tip replacement [message #319044] |
Tue, 26 February 2008 11:26 |
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max cooper
Messages: 414
Registered: April 2005
Location: here and now |
Active Member |
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I've been all over the web and haven't found the answer to this, so maybe someone here can help me out.
I have a Metcal PS2E-01 and I understand that the current OKI tips will work, but I can't figure out a part number.
Thanks in advance!
Max
I'm infinitely baffled.
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| Topic: Westrex RA1594 |
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| Westrex RA1594 [message #318800] |
Mon, 25 February 2008 15:33 |
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YZ
Messages: 214
Registered: January 2006 |
Active Member |
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Hi!
I'm looking for info on the Westrex 1594RA tube compressors.
Google is not helping...
A friend of mine has a pair and wants to sell them, along with a lot of other stuff from that era.
I'd appreciate pointers for the info.
regards,
YZ
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| Topic: joemeek vc6q schematic? |
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| joemeek vc6q schematic? [message #315508] |
Thu, 14 February 2008 14:41 |
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arconaut
Messages: 539
Registered: May 2004
Location: NYC |
Gold Member |
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Anybody have a schematic for one of these puppies?
Thanks,
noah
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| Topic: Prophet 600 schematic |
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| Prophet 600 schematic [message #314644] |
Tue, 12 February 2008 08:54 |
OOF!
Messages: 210
Registered: June 2004 |
Active Member |
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HI,
Anyone with one they can upload? I'm trying to get mine fixed here in nyc and the repair shop has been waiting a month for one. thanks very much,
David
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| Topic: Enlighten me please |
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| Enlighten me please [message #313188] |
Thu, 07 February 2008 13:38 |
Blas
Messages: 163
Registered: July 2006
Location: St. Louis, Mo. |
Active Member |
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As there is this movement to Blu-ray disc, how will/has this impact the audio production. We have software for the current DVD-A work we do (which is very little), but what lies ahead?
What is currently available?
Blas
Conjecture and theory are all well and good...but the proof comes out of the speakers - Fletcher
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| Topic: Auditronics PEQ-82 schematic |
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| Auditronics PEQ-82 schematic [message #310934] |
Thu, 31 January 2008 13:12 |
overbias
Messages: 24
Registered: April 2006
Location: just outside the magic ci... |
Member |
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Hello all,
Recently obtained a PEQ-82 whose power supply has been cannibalized. Sooo.... I need a schematic or someone who knows the the output voltages of the power supply.
Any help would be appreciated.
Thanks,
Jack
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| Topic: Lang schematics... |
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| Topic: Trident B-Range channel amplifier mods |
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| Trident B-Range channel amplifier mods [message #306769] |
Fri, 18 January 2008 07:07 |
Al Bonardi
Messages: 9
Registered: October 2005 |
Member |
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I am racking some of these modules,I know there are some mods to improve gain structure and equalizer headroom,does anybody know these mods?Maybe John Klett of Purple Audio can be so kind to give a helping hand?In the attachment you'll find schematics at:
http://tech.groups.yahoo.com/group/TridentAudio/files/
thanks in advance for your help.
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| Topic: Cooper Time Cube manual |
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| Cooper Time Cube manual [message #299479] |
Fri, 21 December 2007 16:45 |
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John Noll
Messages: 78
Registered: December 2005
Location: Red Bank, NJ |
Member |
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Anyone have a scan of the Cooper Time Cube manual? Thanks.
http://www.retromedia.net
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| Topic: Siemens Klangfilm KLV-017a |
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| Siemens Klangfilm KLV-017a [message #298252] |
Mon, 17 December 2007 04:35 |
muzikhead
Messages: 1
Registered: December 2007 |
Welcome |
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hello! I've stumbled across a pair of Siemens Klangfilm KLV-017a modules. I've been told they're mic pre-amps. can anybody confirm or have some input/ experience with these? Any help would be greatly appreciated. Thanks!
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| Topic: EAB V65 information? |
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