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Trace-Elliot Bipolar Bear
Trace-Elliot Bipolar Bear
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Old 25th August 2014, 07:42 PM   #1
axelrod is offline axelrod  Canada
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Default Trace-Elliot Bipolar Bear

I have the above mentioned board in a TE v-type 300w head . I found a pair of output transistors shorted . I have the new parts ordered but am now wondering if I should do more? I'm somewhat new to this but have a little experience .
Please help .
Thank you.
Alex
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Old 25th August 2014, 10:07 PM   #2
Spiny is offline Spiny  United Kingdom
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If you find outputs short then check back to the drivers, a simple diode check with a meter will show up if the drivers have fried. If you can find a circuit diagram work back and check over the protection circuits.

This may be better in the Instruments and Amps section where the guitar amp folks are.

Alan
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Old 25th August 2014, 10:12 PM   #3
MarcelvdG is offline MarcelvdG  Netherlands
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I only knew Bipolar Bear as a character from the Queer Duck cartoons, interesting that it is also an amplifier board!
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Old 25th August 2014, 10:44 PM   #4
Spiny is offline Spiny  United Kingdom
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this link trace elliot on DIY Audio may be helpful, there are others
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Old 25th August 2014, 11:24 PM   #5
axelrod is offline axelrod  Canada
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Thanks guys , I'll repost this . I was surprised to see that written on a board . It also says " Make it so ,Number One" . ???

I read somewhere that it is advisable to replace all TIP type units and TR11 .

TR11 is a T2N3904 as listed on the parts list.
TR11 need to be completely covered in Heat Transfer Compound (HTC)
This is to ensure that it keeps the unit biased correctly even when the unit
gets hot. If TR11 is not covered then the fan can cool this component down
and give the board a fault reading of temperature and provide and
inappropriate bias.

No metion of how or what to set the Bias VR or the DC Offset VR tho.
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Old 26th August 2014, 12:20 AM   #6
kevinkr is offline kevinkr  United States
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Trace-Elliot Bipolar Bear
Moving to Instruments & Amps. Better to send a request to moderation for a move than to create another thread somewhere else. It should get more responses over there..
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"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine
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Old 26th August 2014, 03:59 AM   #7
Enzo is offline Enzo  United States
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Quote:
Make it so ,Number One
I was going to explain it was a reference to Star Trek, but a quick google of the line tells it all.

Picard - Make It So - YouTube
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Old 26th August 2014, 05:04 AM   #8
axelrod is offline axelrod  Canada
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Default yup

got the reference just wondering about the purpose
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Old 28th August 2014, 05:53 PM   #9
JMFahey is offline JMFahey  Argentina
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Build and use a Light Bulb Limiter
Quite probably you still have other bad parts, this will protect your new transistors and let you make some voltage measurements to find them.
You need a *filament* lamp, not a CFL.
Since 100W ones became unobtainable (unless you have one stashed somewhere) , those "new improved" ones, with a small olive sized quartz halogen filament lamp inside a larger conventional size glass envelope are fine.
Click the image to open in full size.
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Old 29th August 2014, 04:04 AM   #10
axelrod is offline axelrod  Canada
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Built one of those a while ago and have a stock of bulbs
Thanks
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