Low volume and distortion from Bandmaster Reverb. Help!

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3/16/2000 11:06 PM

Dan

Low volume and distortion from Bandmaster Reverb. Help! I just finished blackfacing my 71 Bandmaster Reverb. I also replaced the screen grid resistors with 470k, 2w NTE flameproof resistors. For testing, I am running it into two 8 ohm speakers from a silverface Twin. Now, I know the BMR wants to see a two ohm load, but everyone says Fenders are good for 100% mismatches. But the volume level is really, really low, and it starts distorting at around 3-4 on the dial. The amp on ten is not really loud at all. The tone is actually pretty good. The amp is not noisy or intermittent.     Is this a bad soldering job in the amp? I did remove and replace one of the Twin speakers before doing this. Could I have replaced the speaker leads wrong? I am new at this. I figured I would get pops and crackles if the soldering is bad. Twisting the bias pot didn't make much difference at all to the distortion.     Thanks for any suggestions!     Dan

 

3/17/2000 12:20 AM
John Stokes	Misconception.... The BMR head wants to see a 4 ohm load. That is unless you have put in a SR output tranny. Stock Bandmaster iron is for 4 ohms.     Have you measured all the voltages and are they in the ballpark? Can you inject a signal and follow it through with an o-scope to see where things get screwey?

 

3/17/2000 12:25 AM
Daver	Dan,   Did you really use 470K screen resistors or is that a typo? Usual Fender value is 470ohm. That could be a problem if they're really that big.   Daver

 

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