| Thread | Last Poster | Posts | Pages | Last Post | |
  | Setting Bias on Music Man Amps | Mike Kaus | 81 | 1 | 08-09-10 10:34 am |
| Q-Initial Grid Bias Voltage Setting | Steve Kennedy | 2 | 1 | 04-01-02 04:33 pm |
| HD130R- Q- intermittant distortion | Steve Kennedy | 9 | 1 | 11-28-03 12:43 pm |
| Bass response on 2-10 65 | Steve Kennedy | 6 | 1 | 05-21-06 02:01 pm |
| MM 110-RD Fifty Combo Noise | Anonymous | 5 | 1 | 03-06-06 06:49 pm |
 | A Pair of HD210-130s | Curt | 5 | 1 | 06-03-02 04:49 pm |
| More Stupid Bias Questions. | TFL | 7 | 1 | 03-20-03 05:18 am |
| 112 RD-50 breakup on clean channel | Terry | 5 | 1 | 08-27-02 09:18 am |
| Low volume-have I lost a tube? | gary reynolds | 10 | 1 | 07-27-02 10:25 am |
 | Hum and glowing tubes! | Steve Kennedy | 11 | 1 | 12-08-02 02:47 pm |
| Mm112/rd 65watts | Steve kennedy | 7 | 1 | 08-03-02 10:55 am |
| Power on light on HD130 | Anonymous | 4 | 1 | 03-06-06 06:30 pm |
| Hot front end? | Michael Kaus | 1 | 1 | 08-05-02 06:08 pm |
| HD 150 Bias and tube selection question | Terry | 5 | 1 | 08-28-02 08:34 am |
| Smoking Tubes on HD 130 Reverb | Terry | 2 | 1 | 09-01-02 09:46 pm |
| Overheating | Michael Kaus | 4 | 1 | 09-06-02 04:15 am |
| Tube Question | Terry | 2 | 1 | 09-18-02 04:10 am |
| Setting bias, fairly safe? | Anonymous | 4 | 1 | 03-06-06 03:52 pm |
| Choppy Distortion when on High Gain | Lee Schinagl | 4 | 1 | 10-06-02 01:26 am |
 | RD50 Versions | Mike H | 2 | 1 | 08-15-05 09:34 am |
| Blue glow tube is bad? | Anonymous | 2 | 1 | 03-06-06 04:14 pm |
| RD100 Loud Hum / Bias Issue / Etc... | Anonymous | 2 | 1 | 03-06-06 06:47 pm |
| Poor tone control | Anonymous | 2 | 1 | 03-06-06 04:16 pm |
| Amp repairs | Mike Kaus | 11 | 1 | 07-27-10 07:53 am |
 | 112 Sixty-Five | Matthew Jones | 9 | 1 | 03-10-04 02:30 pm |
| HD130 Tremolo and Pedals and Caps | Anonymous | 3 | 1 | 03-06-06 02:01 pm |
| MM 112 RD Fifty: Hum | Anonymous | 3 | 1 | 03-06-06 06:54 pm |
| About my HD-130 head | Gio | 1 | 1 | 01-10-03 01:09 am |
 | Is bias'ing always required? | John D. | 2 | 1 | 02-02-03 06:18 am |
| Brand of speaker | Anonymous | 3 | 1 | 03-06-06 05:11 pm |
| SORRY, WRONG SECTION | Leslie Richardson | 1 | 1 | 01-20-03 11:41 pm |
 | HI DAD.... | Steve Kennedy | 2 | 1 | 05-12-03 12:58 pm |
| Reissue: Transistor substitutes | Paul | 1 | 1 | 02-03-03 03:49 pm |
| Reverb on Hd130 - 210 | Mark P. | 3 | 1 | 08-25-05 09:52 pm |
| Is this bias bad? | Steve Kennedy | 2 | 1 | 04-04-03 12:57 pm |
| Music Man 112 RP-65 | John Lynch | 1 | 1 | 04-07-03 04:00 pm |
| Pot cleaner? | Anonymous | 5 | 1 | 06-18-03 06:53 am |
| Where's the bias-setting-pot? | Vito | 4 | 1 | 04-22-03 05:00 am |
| New Op-Amps for an RD50 112 | Mike H | 2 | 1 | 11-08-05 06:21 am |
| BIAS Question | Anonymous | 2 | 1 | 03-06-06 04:36 pm |
| Music man amp RD112-50 | Brad Carter | 4 | 1 | 10-10-03 11:56 am |
| Music man 2275-130 schematics??? | Steve Kennedy | 5 | 1 | 03-26-05 05:26 pm |
| Replacement parts question | Terry | 2 | 1 | 08-12-03 09:22 pm |
| RD50 110 | Brad Carter | 3 | 1 | 10-21-03 07:13 pm |
| HD One Fifty Bias question | Terry | 2 | 1 | 10-30-03 09:35 pm |
| Hum that just started | Dave Kolars | 3 | 1 | 10-28-03 07:52 pm |
| Preamp volume | Anonymous | 2 | 1 | 03-06-06 06:42 pm |
| Preamp Feedback RD 112 50 | Steve Kennedy | 2 | 1 | 01-14-04 04:18 pm |
| Vibrato problem, please help! | Terry | 2 | 1 | 11-11-03 08:51 pm |
| 112-75 RP | Anonymous | 2 | 1 | 03-06-06 03:37 pm |
| Crackling popping in my MM HD 212 130 | Steve Kennedy | 2 | 1 | 01-14-04 04:25 pm |
| Filter choke? | Anonymous | 2 | 1 | 03-06-06 04:28 pm |
| 'whine' from 210/65 | Steve Kennedy | 3 | 1 | 01-14-04 04:55 pm |
| 112RD 50 distortion in clean channel | Chris Metcalfe | 8 | 1 | 11-04-06 03:35 am |
| 112 RP 65 repair | Anonymous | 4 | 1 | 03-06-06 05:29 pm |
| Success story for mysterious hum removal | Anonymous | 2 | 1 | 03-06-06 04:41 pm |
| 100RD head bias adjustment | sam | 1 | 1 | 01-19-04 01:22 pm |
| HD 130 410 Fuse Question. Please Help. | JaySi | 3 | 1 | 12-25-04 12:40 pm |
| 112-65 RD First Problem in 21 years | Terry | 2 | 1 | 02-10-04 11:13 pm |
| Replacement OP Amps for 2275 amp | Terry | 2 | 1 | 02-09-04 09:32 pm |
| Wrong Bias in HD 210 | michael kaus | 4 | 1 | 02-19-04 05:01 am |
| Vibrato not working | michael Kaus | 2 | 1 | 02-19-04 05:03 am |
| Re: Groove Tubes 6L6 "GE" | Spot Mandoo | 7 | 1 | 11-13-09 07:52 am |
| Clipping on clean mode | Anonymous | 4 | 1 | 03-06-06 04:28 pm |
| 212HD reverb + tremolo problem | Langley | 2 | 1 | 04-05-04 08:25 am |
| Mm 130 transformer | michael kaus | 1 | 1 | 04-06-04 04:54 am |
| No volume when tone controls a 0 | John Drexler | 3 | 1 | 11-02-04 10:21 am |
| Tube rush | adam | 6 | 1 | 04-12-04 01:33 pm |
| Why set bias so low? | Steve Welk | 1 | 1 | 04-16-04 08:35 pm |
| RD50 crossover distortion | Kenneth L Fox | 3 | 1 | 06-16-04 08:45 pm |
| Rchased a | Anonymous | 8 | 1 | 03-06-06 04:00 pm |
| 212-HD-130 Repair needed in VA | Anonymous | 5 | 1 | 03-06-06 06:29 pm |
| 115 RP reverb | Anonymous | 3 | 1 | 03-06-06 06:55 pm |
| Using a HD150 as a bass amp - what mods? | Steve Kennedy | 2 | 1 | 08-20-04 05:23 pm |
| Dead trem on HD-130. Common culprits? | Anonymous | 7 | 1 | 03-06-06 05:47 pm |
| Single tube plate glow. | Anonymous | 2 | 1 | 03-06-06 04:18 pm |
| Troubleshooting a 2275 130. | Anonymous | 2 | 1 | 03-06-06 04:33 pm |
| RD112 Fifty Reverb hiss | mark | 1 | 1 | 09-23-04 07:30 pm |
| Crackling sound on Input 2 | Anonymous | 4 | 1 | 03-06-06 04:00 pm |
| Runaway BIAS issue | pguida | 3 | 1 | 11-04-04 08:04 am |
| Music man RP100 | Anonymous | 8 | 1 | 03-06-06 06:40 pm |
| A/B box | Anonymous | 4 | 1 | 03-06-06 06:39 pm |
| Popping and Crackling noise Intermitting | Anonymous | 5 | 1 | 03-06-06 04:14 pm |
| How can I tell if Reverb is working? | Anonymous | 10 | 1 | 03-06-06 04:01 pm |
| Hi/low switch decrease power by 1/2?? | michael kaus | 2 | 1 | 12-19-04 07:21 am |
| Schematics?? | JaySi | 2 | 1 | 12-30-04 01:27 pm |
| Bias voltage for 12ax7 HD130 w/E34L? | Doug Elick | 14 | 1 | 01-01-05 11:08 am |
| Did new E34L fail during bias? | Anonymous | 3 | 1 | 03-06-06 04:47 pm |
| Standby without speaker | Steve Kennedy | 3 | 1 | 01-15-05 09:32 pm |
| Lots of questions please help | Steve Kennedy | 6 | 1 | 01-15-05 09:36 pm |
| RD 2100 Distortion issues | Steve Kennedy | 2 | 1 | 01-30-05 06:04 pm |
| "Clipping" sound from 210 Sixty Five | michael kaus | 2 | 1 | 01-18-05 04:48 am |
| Bias setting for 210 Sixty Five ? | Steve Kennedy | 3 | 1 | 01-30-05 06:06 pm |
| Use EL-34s or 6AC7s? Does it matter? | Anonymous | 3 | 1 | 03-06-06 04:16 pm |
| 112-RP-100 Won't Power up! | Steve Kennedy | 2 | 1 | 01-30-05 06:09 pm |
| 112-sixty five power output problem | michael kaus | 8 | 1 | 02-19-05 02:27 pm |
 | Just got Musicman 4x10 HD "Sixty-Five" | cerebralsugar | 25 | 1 | 02-25-05 06:42 am |
| LM307 replacement/troubleshooting my pre | michaelkaus | 3 | 1 | 02-05-05 02:36 pm |
| Tremolo on high but not low power | Steve Kennedy | 3 | 1 | 02-10-05 08:44 pm |
| 65 Reverb Biasing | michael kaus | 2 | 1 | 02-13-05 03:08 pm |
| HD130 biasing question | Anonymous | 2 | 1 | 03-06-06 04:50 pm |
| Replacing jbl E120-B 12" speaker | Tom C | 3 | 1 | 02-22-05 01:36 pm |
| Oregon: Shop for Overhaul? | Anonymous | 2 | 1 | 03-06-06 04:13 pm |
| Low power setting? ...210-65 | michael kaus | 3 | 1 | 03-01-05 04:42 am |
| Power Transformer for HD-212 | Steve Kennedy | 3 | 1 | 03-26-05 05:27 pm |
| Sudden volume change on HD130 | michael kaus | 6 | 1 | 03-27-05 03:56 pm |
| My 212 sixty five and HD150 head | michael kaus | 4 | 1 | 03-25-05 04:45 am |
| Need Help With 112RP-65 | Carl Montney | 10 | 1 | 04-15-05 05:07 pm |
| 210 hd 130 help needed | michael kaus | 2 | 1 | 04-12-05 04:36 am |
| Active electronics -Bias | david wolf | 4 | 1 | 05-06-05 02:37 am |
| Rd112 100 info? | Steve Kennedy | 2 | 1 | 05-05-05 02:58 pm |
| 112-65 RP | Steve Kennedy | 2 | 1 | 05-06-05 03:53 pm |
| 410HD130 Tube Replacement and biasing | michael kaus | 4 | 1 | 05-12-05 02:53 pm |
| Biasing capacitors | aryl | 13 | 1 | 06-08-05 02:19 am |
| A little MM voodoo ?!? | Le Basseur | 4 | 1 | 06-07-05 08:27 am |
| 112 RD-6L6 or 6CA7? | Tom C | 3 | 1 | 06-25-05 08:54 am |
| Troubleshoot Slight Distortion 112RP65 | Mike H. | 4 | 1 | 07-27-05 11:05 pm |
| Seemly Low Volume HD-130 | mike kaus | 6 | 1 | 12-29-05 03:54 pm |
| Unpleasant distortion, low volume... | michael kaus | 11 | 1 | 08-10-05 04:39 am |
| Power Light | Walter Jowers | 7 | 1 | 08-22-06 10:00 am |
| Undertone | Steve Kennedy | 4 | 1 | 08-12-05 04:55 pm |
| Yet another bias Q: HD-130 (SS preamp) | Mike | 3 | 1 | 05-16-07 07:00 pm |
 | RED PLATE GLOW | michael kaus | 2 | 1 | 10-13-05 04:43 am |
| Where' da MM T-shirts that were on Ebay | eric_ellman | 4 | 1 | 11-29-05 12:35 pm |
| Can Rev and Trem be added to Channel 1? | The Problem Solver | 8 | 1 | 11-07-05 06:18 am |
| RD50 Revisions | Mike H. | 3 | 1 | 11-14-05 07:20 pm |
| Clipping and treble loss | mike kaus | 4 | 1 | 12-01-05 04:42 am |
| Electrolytics | mike kaus | 2 | 1 | 11-29-05 03:44 pm |
 | HD130 rectifier board arcing | mike kaus | 2 | 1 | 12-03-05 08:23 am |
| Merry Christmas | Steve Kennedy | 2 | 1 | 12-30-05 05:37 pm |
| 210-130 HD low vol, hot tubes | Problem Solver | 32 | 1 | 01-28-06 01:29 pm |
| Procedure for biasing HD212-130 | bluepill | 3 | 1 | 02-21-06 02:39 pm |
| Good music man amp tech in NYC? | Phil G | 2 | 1 | 03-10-06 10:09 am |
| Zioxqw | zioxqw | 1 | 1 | 03-11-06 05:08 pm |
| MM 412 GS Speaker Grill Removal | carl from aus | 6 | 1 | 03-21-06 10:28 pm |
| Tremolo has no volume | mike kaus | 6 | 1 | 04-12-06 04:17 am |
| Difference between 210-65 and 212-65 | carl. | 5 | 1 | 04-10-06 03:25 am |
| Voltage values tremolo circuit in HD130? | Scott Cannon | 3 | 1 | 04-11-06 07:19 pm |
| GT bias tool | Clayton Choate | 8 | 1 | 04-25-06 10:11 am |
| Repair / Maintenance questions | Warren Peace | 2 | 1 | 04-26-06 11:00 am |
| 2x12 Sixty Five Bias/Tube Question | bradleyny | 4 | 1 | 05-05-06 06:12 am |
| Problems with biasing my HD130 | dennis v | 3 | 1 | 05-10-06 04:21 am |
| Reverb gone on the HD130 Head...off EBay | Steve Kennedy | 2 | 1 | 05-20-06 10:25 am |
| Another Endorsement for Terry Loose | Mark Lewis | 3 | 1 | 02-05-08 07:40 am |
| Help! My 112 Sixty-Five sounds bad | Brian Beebe | 6 | 1 | 05-29-06 08:24 pm |
| Ideas on making an RD50 less trebley? | Chris Metcalfe | 3 | 1 | 10-26-06 10:40 am |
| 212 HD130 sounding too compressed. | Steve Kennedy | 4 | 1 | 06-24-06 11:31 pm |
| When do you get preamp distortion ?? | Andrew Wilson | 5 | 1 | 11-12-06 11:23 am |
| Testing for Microphonic Tubes | Edward Solberg | 2 | 1 | 07-02-06 08:16 am |
| It's broke--RD112-100 | William Nexson | 4 | 1 | 08-13-06 08:41 am |
 | Best sounding MusicMan amps? | Mike Kaus | 2 | 1 | 08-16-06 03:42 am |
| Problems with biasing my MM hd130 | Mike Kaus | 2 | 1 | 09-14-06 04:25 am |
| RD50 intermittent fault/ recapping | Mike Kaus | 4 | 1 | 10-16-06 10:37 am |
| MM design objectives - idle bias levels | Chris Metcalfe | 1 | 1 | 10-20-06 04:48 am |
| Preamp distortion...Help... | Andrew Wilson | 10 | 1 | 11-21-06 12:22 pm |
| MM HD 210 One Thirty | Mike Kaus | 7 | 1 | 11-16-06 04:26 am |
| Weird hum 410-65 | Walter Jowers | 6 | 1 | 12-18-06 05:08 pm |
| Distortion Issue solved... I hope | Jeremy Shaw | 3 | 1 | 11-23-06 03:51 pm |
| Signal clipping at the PI tube ? | Andrew Wilson | 11 | 1 | 11-30-06 06:39 pm |
| Voltage info needed | Andrew Wilson | 1 | 1 | 11-28-06 09:55 am |
| Need a power switch for 130 head | Mike Kaus | 7 | 1 | 12-25-06 01:24 pm |
| Faulty Speaker Plug | Peter Maziar | 1 | 1 | 12-20-06 07:19 am |
| General overhauling a 112RD50 | Dirk Wacker | 1 | 1 | 02-13-07 01:52 am |
| Any service bulletins for 112RD50 ? | Dirk Wacker | 1 | 1 | 02-13-07 02:04 am |
| 210-65 was buzzing B-adly | Edward Solberg | 3 | 1 | 02-24-07 06:44 am |
| Reverb question | Mike Kaus | 2 | 1 | 04-04-07 04:09 pm |
| Trying to clean up my clean tone | Mike | 8 | 1 | 05-30-07 08:13 pm |
| MUSIC MAN HD150 Power Transformer | gsonique | 4 | 1 | 05-17-07 07:07 pm |
| Pulling 2 Tubes on a 210 HD 130 | Ingo Raven | 4 | 1 | 07-24-07 01:57 am |
| MM HD 210-130 distortion tone problem??? | Andrew Wilson | 2 | 1 | 07-18-07 06:38 pm |
| HD130 acting up again, any thoughts ??? | Edward Solberg | 5 | 1 | 07-20-07 06:34 pm |
| Amp tech in the UK who knows these amps? | Mike | 3 | 1 | 06-27-07 08:44 am |
| Little Volume Control | Todd Gunby | 4 | 1 | 01-15-08 09:51 am |
| What is wrong with my HD-130 head | Steve Tarabokia | 4 | 1 | 09-10-07 08:27 am |
| Amp from 1975. Does it need new caps? | Giorgio | 5 | 1 | 09-14-07 05:15 pm |
| Help ! Buzzing on RD112 100W combo | Jim Gaudoin | 1 | 1 | 09-13-07 05:50 am |
| Awesome | Kevin Kelley | 1 | 1 | 09-16-07 05:38 pm |
| Most Helpfull Forum - Thanks | Jim Wainwright | 1 | 1 | 10-22-07 04:52 am |
| Intermittent tone drop | Mike Kaus | 2 | 1 | 10-24-07 04:26 am |
| Deep Switch Won't Work | Jeremy Mock | 3 | 1 | 10-26-07 03:05 pm |
| Best Overdrive pedal for 210-65 | Peter Maziar | 9 | 1 | 02-02-08 07:28 am |
| No sound with 210HD/130-12AX7 | Josue Roberto Lopez | 16 | 1 | 04-17-08 09:34 am |
| Bias Settings for RD112 One Hundred | Bill Traylor | 2 | 1 | 02-26-08 12:59 am |
| Tech Advice: 1980-2008 MODS? | Marc Mulay | 1 | 1 | 02-27-08 05:06 am |
| Carbon Resistors in you Music Man | Peter Maziar | 3 | 1 | 04-07-08 03:09 pm |
| Why is my hd130 farting at me? | Mike Kaus | 2 | 1 | 04-17-08 04:12 am |
| HD1390210 picks up radio stations | Matthew Lehr | 6 | 1 | 05-03-08 05:51 am |
| Volume Question | Bill Traylor | 4 | 1 | 06-28-08 09:11 pm |
| . RD 112 50 - The resistor eater | Tom Siegel | 10 | 1 | 01-23-09 02:10 pm |
| Set the bias - replacing like tubes? | Ben Moore | 6 | 1 | 07-30-08 06:00 am |
| Stuck tremelo on 210HD-130 | Bill Traylor | 5 | 1 | 09-20-08 12:45 am |
| Need help fixing my MM Sixty Five | Mike Kaus | 6 | 1 | 10-08-08 04:10 am |
| Happy Holidays | Tom Siegel | 6 | 1 | 01-24-09 12:59 pm |
| Bias creep on a RD65-112 | Mike Kaus | 4 | 1 | 01-07-09 04:12 am |
 | Help with some info | Sean Flannery | 10 | 1 | 05-20-10 12:40 pm |
| Blown Tube (?) On 112-65 | Mike Kaus | 2 | 1 | 02-20-09 04:21 am |
| Problems with blown valve and fuses | Mike Kaus | 2 | 1 | 02-22-09 06:42 am |
| RD100 115 reverb problem | John Paonessa | 3 | 1 | 03-09-09 05:59 am |
| Potentiometer for MM | Thomas Leong | 17 | 1 | 04-06-09 03:39 am |
| Heavy Distortion on 2275-65 | Mael Bellec | 9 | 1 | 04-03-09 06:12 am |
| HD130 Settings | Dave Gossett | 4 | 1 | 06-25-09 07:46 pm |
| Sixty-five Reverb-less | Daniel Hall | 1 | 1 | 07-13-09 11:21 am |
| 1976 112 Sixty-five bias question | Giordano da Silva | 3 | 1 | 07-22-09 02:32 pm |
| 410 130 goes "bassy" after warming up | Mike Kaus | 2 | 1 | 11-13-09 05:17 pm |
| HD 212 130 ,12ax7 . Bias findings. | Graeme Wilton | 5 | 1 | 11-29-09 02:00 pm |
| Noisy HD212 | Ed Goforth | 6 | 1 | 12-12-09 04:18 pm |
| Amp repair success story (MM HD-130) | Mike Kaus | 2 | 1 | 12-08-09 07:20 am |
| Footswitch or Phasor Repair for 112 RP65 | Cliff Goodwin | 1 | 1 | 12-15-09 09:32 am |
| Footswitch or Phasor Repair for 112 RP65 | Mike Kaus | 2 | 1 | 12-17-09 01:38 pm |
| Hd 150 volume loss is confusing me | Lars Verholt | 6 | 1 | 02-17-10 05:48 pm |
| HD One-Fifty Head Tone Control latency | Bill Traylor | 4 | 1 | 09-03-10 01:48 am |
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