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  1. dorke

    Changing a tweeter with a speaker.

    Couldn't find the amp on the web. The A-X340 and 350 are 30W RMS per channel. soI think the 330 should be about the same. I wonder were dose 90W or 270W come from? Connecting 2 small 3W/4ohm speakers in series instead of the tweeter will get you a 6W/8ohm equivalent tweeter. With a 30W RMS(like...
  2. dorke

    Converting a T-Bar battery connector into...something else?

    A 2 -pole connector will work, you probably need something like 50A rating. like this one: http://www.ebay.com/itm/2-x-ANDERSON-STYLE-50-AMP-PLUG-CONNECTORS-JOINER-50A-600V-/221833669106?hash=item33a65129f2&vxp=mtr
  3. dorke

    Converting a T-Bar battery connector into...something else?

    The quick disconnect is probably why the used a T-bar. What about charging the battery, Is there a "charge input socket", or do you have to remove the battery for charging "indoors"? Looks like you should use the T-bar battery adapter-the battery side socket. like this one...
  4. dorke

    Converting a T-Bar battery connector into...something else?

    I think the easiest thing to do would be to open the T-bar connector ,remove the electrical "pointed" contacts and replace them with "standard" connections. This way you keep the "old wires"and don't worry about gauge etc Very important: 1.Marking and keeping the correct polarity. 2.Make a...
  5. dorke

    Changing a tweeter with a speaker.

    NeonSerg, What is the model of that system? Is it a "boom box" style, the one that has speakers attached on it's sides? What is the size of the speaker box,what is the size(diameter) of the woofer inside? Is the rating of power in RMS watts?other "type" of power?
  6. dorke

    Fixing broken and unbroken equipment

    About capacitance meters: I found those 100uF(or 200uF) DMM testers to be useless for the "big boys caps". In power supplys of various equipment (computer boards,LCD displays,audio gear etc.) the caps range in the 1000uF and higher... The largest I have seen is 10,000 uF in an Audio PA linear...
  7. dorke

    Is it EEPROM: Can't delete or overwrite on Channel Preset

    You sound totally clueless... Contact the company, they are the only ones who can help you. Here it is again: https://uk.hama.com/service/contact/hama-enquiry
  8. dorke

    PA mixer / amp repair help

    Try taking some closeup photos so we can try and work things out. About schematics: Crate went through several acquisitions: now days it is under "LOUD Technologies Inc." . It was before under "Ampeg" then "St. Louis Music, Inc". I found this O.M+Schematics (free of charge), the schematics...
  9. dorke

    Is it EEPROM: Can't delete or overwrite on Channel Preset

    I think the best would be to contact the company technical service: https://uk.hama.com/service Here is the link to your product user-manual (in case you don't have it)...
  10. dorke

    CRT tv blowing fuses after clean

    Nice to hear that:) Don't clean it to much...just gently with a brush and vacuum cleaner. CRT TVs work fine with dust since they have openings to dissipate the heat buildup in them. As they say, If it ain't broken don't fix it...;)
  11. dorke

    CRT tv blowing fuses after clean

    At first just remove the dust with a brush. After that, use a vacuum cleaner with a "narrow head" to suck the dust away(not to close to the components they can be damaged!) Rubbing alcohol is what I clean with, but only in the places it is needed(solidified dirt etc.) The freezing itself will...
  12. dorke

    CRT tv blowing fuses after clean

    1.First thing to do is take a small 1/2" paint brush and remove the dust from the board till it is very clean and then try again. 2.It can be that the liquid solidified some dirt causing the fuse to blow. 3.Some close-up photos can help a lot.
  13. dorke

    Is it EEPROM: Can't delete or overwrite on Channel Preset

    The radio has a clock. Does it keep the correct time when power is disconnected(did it ever)? If it did but doesn't do that anymore, you should look for a backup battery in the radio.. How many stations do you have on the radio?There may be a limit to that number. Are you able to retrieve stored...
  14. dorke

    PA mixer / amp repair help

    O.K. no sound from line-in means a fault in the PA signal path. Since you don't have a scope to trace the signal,the only way to find the fault isto check DC voltages and devices. Start with no-power diode-Ohm testing D1,D2. Check voltages on D3,D4 and on Q1-Q6(B-E-C). Please,let us know the...
  15. dorke

    Help with identification.

    If that IC is the only thing the lightning fried you are very lucky... I would check every device connected to pins 4 and 6 , and preferably all devices on the board ,even those that don't show visible damage .
  16. dorke

    Power supply- +17VDC, -17VDC

    osp001, This 5$ +/-18VDC PS can make life easier for you. You can drop the voltage by 0.7V with 2x 1n4002 in series with the outputs to get about +/-17.3V. You will need to add a (16-18)V AC center-tape transformer...
  17. dorke

    PA mixer / amp repair help

    O.K. the bias is correct. Are you getting any sound from the AMP at the speakers-out (with the headphones ,as above,no speakers just the "1k-headphones" ) or just the hum noise? You can try feeding a signal to Line-In J3 -start with very low signal , does it produce sound(with headphone at the...
  18. dorke

    PA mixer / amp repair help

    1.You probably measured at the collectors of Q8-Q9, look at the pinout of the TIP31-32 attached. 2.Try the same "noise test" with Line-In (J3-in amp schematics): insert a "shorted plug" into J3 (i.e center pin connected to outer one, without a cable, just the plug opened and...
  19. dorke

    Bad Capacitor?

    The varnish is not a problem,don't scrap it. Just remove the splashes gently ,and clean with alcohol and a cotton swab-stick. If you think any solder-point needs re-soldering ,solder it well. Check for shorts on the entire board between adjacent solder-points. I would replace that "smashed"...
  20. dorke

    Bad Capacitor?

    First thing ,the board is full with "solder splashes",probably causing a short circuit on the board. They should be removed gently(with a small screwdriver and an old tooth brush). remove all of them then test again. See the bigger ones in the photo( in red).
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