| Author | Message | ||
| Dave |
Hi, Great web site! I've been playing through a Music Man amp since the late 70's. Thank you so much for providing a place where everybody can find all this great information about Music Man amps. I have a Music Man HD 130 reverb (with the 12AX7 tube) amp head. The original reverb tank has been replaced with another tank that really doesn't sound very good at all. I do have the original tank with one broken spring. I'd like to get it fixed and put back in my amp. I guess my question is.... What I have to do is find some replacement springs,(anybody know someone?) then find a tech to switch the tanks. Is there anything else I should be aware of? Just want to make sure I've got all the bases covered. Thank you for yor time. Best Regards, Dave | ||
| michael kaus |
Don't know where to get replacement springs but the tank itself has been replaced for yrs with an Accutronics tank. Look in this section for the right one for your amp. Mike. | ||
| Dave |
Thanks Mike, I'll give it a look. Dave | ||
| Dave |
Hi, I talked to a real nice fellow at Antique Electronic Supply. He has two reverb tanks that might fit my amp, one is a 150 ohm input and the other is a 1475 ohm input. Does anybody know which one is the right one? The one that was in my amp was a Accutronic 16 3/4" two spring tank.(I could not find a part number on it) The amp it was in is a Music Man HD130 Reverb Head with the 12AX7 tube. Thanks for any help you can give, Dave. | ||
| Dave |
I miswrote the above post, it's a question of which is the right input impedance for the amp. Can anybody help, I'll even take a good guess. I just want to get her back sounding like a Music Man amp. Thanks again for any help, Dave. | ||
| Ronnie Evans (ronrd50) Username: ronrd50 Registered: 05-2013 |
I followed Ed Goforth's advice and installed a MOD 8BB3D1B long delay reverb tank in my MM RD50. It works much better with no hum, strong output, and more like the old Fender reverbs. I had to experiment and install a 45 dB L-pad to attenuate the return so the Reverb control would operate at "5" mid range on the knob. I mounted the passive pad in an old film canister.   | ||
| Ronnie Evans (ronrd50) Username: ronrd50 Registered: 05-2013 |
I followed Ed Goforth's advice and installed a MOD 8BB3D1B long delay reverb tank in my MM RD50. It works much better with no hum, strong output, and more like the old Fender reverbs. I had to experiment and install a 45 dB L-pad to attenuate the return so the Reverb control would operate at "5" mid range on the knob. I mounted the passive pad in an old film canister.  | ||
| Ronnie Evans (ronrd50) Username: ronrd50 Registered: 05-2013 |
I followed Ed Goforth's advice and installed a MOD 8BB3D1B long delay reverb tank in my MM RD50. It works much better with no hum, strong output, and more like the old Fender reverbs. I had to experiment and install a 45 dB L-pad to attenuate the return so the Reverb control would operate at "5" mid range on the knob. I mounted the passive pad in an old film canister. | ||
| Ronnie Evans (ronrd50) Username: ronrd50 Registered: 05-2013 |
I followed Ed Goforth's advice and installed a MOD 8BB3D1B long delay reverb tank in my MM RD50. It works much better with no hum, strong output, and more like the old Fender reverbs. I had to experiment and install a 45 dB L-pad to attenuate the return so the Reverb control would operate at "5" mid range on the knob. I mounted the passive pad in an old film canister.  | ||
| Ronnie Evans (ronrd50) Username: ronrd50 Registered: 05-2013 |
The L-Pad should be plugged underneath the chassis in the return RCA jack. That way the signal stays strong until reaching the chassis thus less chance of picking up stray hum and noise. |
Tue, 03/25/2014 - 09:27
#1
HD-130 reverb tank
I have had good results with The MOD series tanks, the RD50 takes the 8BB3D1B long delay, the 8BB2D1B is the medium delay (The 2 is for 2-springs, the 3 is 3-springs, a link at the end of my comment is the cross reference chart regarding the number codes. Remember the reverb control needs to be changed from 25k Liner to 25k Audio, if you want a slower amount of reverb that's a lot easier to fine tune for lower reverb settings, especially when changing to longer delay time tanks.. When using the longer delay tank, your reverb with hit you like a titan wave, as it comes on too fast. The original tank for the RD were intended for more back ground reverb, not so much for surf, changing to 25k Audio taper allows the amount of reverb to mix in at a much more slower rate at the beginning and comes on stronger at the last part of the rotation, for those about ready to SURF :D
For the HD-65/130 reverbs, the MOD 4FB3A1B, is a long delay 2 spring unit, I have been looking for a 3-spring long delay for a client that wants to go surfing from time to time. But The only one close is the Accutronics 9EB3C1B Reverb Tank, that is designed for solid state reverb driver circuits, but the impedance is a bit different, Music Man HD-65/130 wants to see 1475 ohms at the input of the tank and 2250 ohms at the output of the tank. This link takes you to the codes found on the tank so you can figure out what it means so you can get the right replacement. The MOD tanks should cross with these numbers, if you enter the Accutronics number, asking for the MOD tank counterpart.
https://www.tubesandmore.com/tech-corner/accutronics-products-and-specif...
There are other links but this one was convenient at this time.