RB-1070 repair

[miner]

This is the email I got from Rotel about my RB-1070 repair:

Here is what was tested and replaced on your unit.





REPLACED 2 OPEN FUSES (F602 & F604). CHECKED THD @ FULL POWER. CHECKED/ADJUSTED BIAS LEVELS. CHECKED BRIDGED MONO OPERATION. CHECKED 12 VOLT TRIGGER CIRCUIT IN & OUT



Andrew Shaw
Asst. Service Manager
Rotel / B&W Service
Ashaw@bwgroupusa.com
tel. 1-800-370-3741x229
fax 1-800-681-0673

At least it was just fuses and nothing major. All under warranty. I do have to pay for shipping though - $48. I now have a back-up for my RB-1092.

[gianni]

Any chance you might a/b these amps? Woukd be interesting?

[miner]

That is my plan this weekend. Unfortuantely my pre does not have a balance on it so I will just have to hook each up independantly.

[gianni]

Looking forward to your impressions. Don't remember which pre you have. Only thing you need to do to get a good a/b is make sure you level match as closely as possible.

[miner]

My pre was RC-1070, now RC-1090. The RC1070 & RB-1070 will be relagated to Bedroom dutry. To get a level match will I need a SPL meter?

[gianni]

You could use an SPL meter or measure the voltage at the speaker. If you use an SPL meter, it would probably be easier by using a test tone of some sort, perhaps a warble tone such as those found on many test CD's.

If a test CD is not available you could use music - just find a slower passage, preferably with a solo insrument and measure both amps at exactly the same point in the recording. Use the 'slow' setting - it's much easier to read. Try to match them within 1/2 a db or less.