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  Thread Last Poster Posts Pages Last Post
Setting Bias on Music Man AmpsPaul Huish 119 08-29-13  04:28 am
Q-Initial Grid Bias Voltage SettingSteve Kennedy04-01-02  06:33 pm
HD130R- Q- intermittant distortionSteve Kennedy11-28-03  02:43 pm
Bass response on 2-10 65Steve Kennedy 05-21-06  04:01 pm
MM 110-RD Fifty Combo Noise Anonymous03-06-06  08:49 pm
A Pair of HD210-130sCurt06-03-02  06:49 pm
More Stupid Bias Questions. TFL03-20-03  07:18 am
112 RD-50 breakup on clean channelTerry08-27-02  11:18 am
Low volume-have I lost a tube?Mike Kaus 12 04-26-11  12:48 pm
Hum and glowing tubes!David Gereg 12 10-14-11  07:34 pm
Mm112/rd 65wattsSteve kennedy08-03-02  12:55 pm
Power on light on HD130 Anonymous03-06-06  08:30 pm
Hot front end?Michael Kaus08-05-02  08:08 pm
HD 150 Bias and tube selection questionTerry08-28-02  10:34 am
Smoking Tubes on HD 130 ReverbTerry09-01-02  11:46 pm
OverheatingMichael Kaus09-06-02  06:15 am
Tube QuestionTerry09-18-02  06:10 am
Setting bias, fairly safe? Anonymous03-06-06  05:52 pm
Choppy Distortion when on High GainLee Schinagl10-06-02  03:26 am
RD50 VersionsMike H08-15-05  11:34 am
Blue glow tube is bad?Anonymous03-06-06  06:14 pm
RD100 Loud Hum / Bias Issue / Etc...Anonymous03-06-06  08:47 pm
Poor tone controlAnonymous03-06-06  06:16 pm
Amp repairsMike Kaus 11 07-27-10  09:53 am
112 Sixty-FiveJay Hammond 10 01-11-11  09:14 pm
HD130 Tremolo and Pedals and CapsAnonymous03-06-06  04:01 pm
MM 112 RD Fifty: HumAnonymous03-06-06  08:54 pm
About my HD-130 headGio01-10-03  03:09 am
Is bias'ing always required?John D.02-02-03  08:18 am
Brand of speakerAnonymous03-06-06  07:11 pm
SORRY, WRONG SECTIONLeslie Richardson01-21-03  01:41 am
HI DAD....Steve Kennedy05-12-03  02:58 pm
Reissue: Transistor substitutesPaul02-03-03  05:49 pm
Reverb on Hd130 - 210Mark P.08-25-05  11:52 pm
Is this bias bad? Steve Kennedy04-04-03  02:57 pm
Music Man 112 RP-65John Lynch04-07-03  06:00 pm
Pot cleaner?Anonymous06-18-03  08:53 am
Where's the bias-setting-pot?Vito04-22-03  07:00 am
New Op-Amps for an RD50 112Mike H11-08-05  08:21 am
BIAS QuestionAnonymous03-06-06  06:36 pm
Music man amp RD112-50Brad Carter10-10-03  01:56 pm
Music man 2275-130 schematics???Steve Kennedy 03-26-05  07:26 pm
Replacement parts questionTerry08-12-03  11:22 pm
RD50 110Brad Carter10-21-03  09:13 pm
HD One Fifty Bias questionTerry10-30-03  11:35 pm
Hum that just startedDave Kolars10-28-03  09:52 pm
Preamp volumeAnonymous03-06-06  08:42 pm
Preamp Feedback RD 112 50 Steve Kennedy01-14-04  06:18 pm
Vibrato problem, please help! Terry11-11-03  10:51 pm
112-75 RP Anonymous03-06-06  05:37 pm
Crackling popping in my MM HD 212 130Steve Kennedy01-14-04  06:25 pm
Filter choke?Anonymous03-06-06  06:28 pm
'whine' from 210/65 Steve Kennedy01-14-04  06:55 pm
112RD 50 distortion in clean channelChris Metcalfe 11-04-06  05:35 am
112 RP 65 repairAnonymous03-06-06  07:29 pm
Success story for mysterious hum removalAnonymous03-06-06  06:41 pm
100RD head bias adjustmentsam01-19-04  03:22 pm
HD 130 410 Fuse Question. Please Help.JaySi12-25-04  02:40 pm
112-65 RD First Problem in 21 yearsTerry02-11-04  01:13 am
Replacement OP Amps for 2275 ampTerry02-09-04  11:32 pm
Wrong Bias in HD 210michael kaus02-19-04  07:01 am
Vibrato not workingmichael Kaus02-19-04  07:03 am
Re: Groove Tubes 6L6 "GE"Spot Mandoo 11-13-09  09:52 am
Clipping on clean modeAnonymous03-06-06  06:28 pm
212HD reverb + tremolo problemLangley04-05-04  10:25 am
Mm 130 transformermichael kaus04-06-04  06:54 am
No volume when tone controls a 0John Drexler11-02-04  12:21 pm
Tube rushadam04-12-04  03:33 pm
Why set bias so low?James Hawkins 12-03-13  07:03 pm
RD50 crossover distortionKenneth L Fox06-16-04  10:45 pm
Rchased aAnonymous03-06-06  06:00 pm
212-HD-130 Repair needed in VAAnonymous03-06-06  08:29 pm
115 RP reverbAnonymous03-06-06  08:55 pm
Using a HD150 as a bass amp - what mods?Steve Kennedy08-20-04  07:23 pm
Dead trem on HD-130. Common culprits?Anonymous03-06-06  07:47 pm
Single tube plate glow.Anonymous03-06-06  06:18 pm
Troubleshooting a 2275 130.Anonymous03-06-06  06:33 pm
RD112 Fifty Reverb hissmark09-23-04  09:30 pm
Crackling sound on Input 2Anonymous03-06-06  06:00 pm
Runaway BIAS issuepguida11-04-04  10:04 am
Music man RP100 Anonymous03-06-06  08:40 pm
A/B boxAnonymous03-06-06  08:39 pm
Popping and Crackling noise IntermittingAnonymous03-06-06  06:14 pm
How can I tell if Reverb is working?Anonymous10 03-06-06  06:01 pm
Hi/low switch decrease power by 1/2??michael kaus12-19-04  09:21 am
Schematics??JaySi12-30-04  03:27 pm
Bias voltage for 12ax7 HD130 w/E34L?Doug Elick14 01-01-05  01:08 pm
Did new E34L fail during bias? Anonymous03-06-06  06:47 pm
Standby without speakerSteve Kennedy 01-15-05  11:32 pm
Lots of questions please helpSteve Kennedy 01-15-05  11:36 pm
RD 2100 Distortion issuesSteve Kennedy 01-30-05  08:04 pm
"Clipping" sound from 210 Sixty Fivemichael kaus01-18-05  06:48 am
Bias setting for 210 Sixty Five ?Steve Kennedy 01-30-05  08:06 pm
Use EL-34s or 6AC7s? Does it matter?Anonymous03-06-06  06:16 pm
112-RP-100 Won't Power up! Steve Kennedy 01-30-05  08:09 pm
112-sixty five power output problemmichael kaus02-19-05  04:27 pm
Just got Musicman 4x10 HD "Sixty-Five"cerebralsugar25 02-25-05  08:42 am
LM307 replacement/troubleshooting my premichaelkaus02-05-05  04:36 pm
Tremolo on high but not low powerSteve Kennedy 02-10-05  10:44 pm
65 Reverb Biasingmichael kaus02-13-05  05:08 pm
HD130 biasing questionAnonymous03-06-06  06:50 pm
Replacing jbl E120-B 12" speakerTom C02-22-05  03:36 pm
Oregon: Shop for Overhaul?Anonymous03-06-06  06:13 pm
Low power setting? ...210-65michael kaus03-01-05  06:42 am
Power Transformer for HD-212Steve Kennedy 03-26-05  07:27 pm
Sudden volume change on HD130michael kaus03-27-05  05:56 pm
My 212 sixty five and HD150 headJay Hammond 01-11-11  09:52 pm
Need Help With 112RP-65Carl Montney10 04-15-05  07:07 pm
210 hd 130 help neededmichael kaus04-12-05  06:36 am
Active electronics -Biasdavid wolf05-06-05  04:37 am
Rd112 100 info?Steve Kennedy 05-05-05  04:58 pm
112-65 RPSteve Kennedy 05-06-05  05:53 pm
410HD130 Tube Replacement and biasingmichael kaus05-12-05  04:53 pm
Biasing capacitorsaryl13 06-08-05  04:19 am
A little MM voodoo ?!?Le Basseur06-07-05  10:27 am
112 RD-6L6 or 6CA7?Tom C06-25-05  10:54 am
Troubleshoot Slight Distortion 112RP65Mike H.07-28-05  01:05 am
Seemly Low Volume HD-130mike kaus12-29-05  05:54 pm
Unpleasant distortion, low volume...michael kaus11 08-10-05  06:39 am
Power LightTerry Loose 01-31-11  09:24 am
UndertoneSteve Kennedy 08-12-05  06:55 pm
Yet another bias Q: HD-130 (SS preamp)Mike 05-16-07  09:00 pm
RED PLATE GLOWmichael kaus10-13-05  06:43 am
Where' da MM T-shirts that were on Ebayeric_ellman11-29-05  02:35 pm
Can Rev and Trem be added to Channel 1?The Problem Solver11-07-05  08:18 am
RD50 RevisionsMike H.11-14-05  09:20 pm
Clipping and treble lossmike kaus12-01-05  06:42 am
Electrolyticsmike kaus11-29-05  05:44 pm
HD130 rectifier board arcingmike kaus12-03-05  10:23 am
Merry ChristmasSteve Kennedy 12-30-05  07:37 pm
210-130 HD low vol, hot tubesProblem Solver32 01-28-06  03:29 pm
Procedure for biasing HD212-130bluepill02-21-06  04:39 pm
Good music man amp tech in NYC?Phil G03-10-06  12:09 pm
Zioxqwzioxqw03-11-06  07:08 pm
MM 412 GS Speaker Grill Removalcarl from aus03-22-06  12:28 am
Tremolo has no volumemike kaus04-12-06  06:17 am
Difference between 210-65 and 212-65carl.04-10-06  05:25 am
Voltage values tremolo circuit in HD130?Scott Cannon04-11-06  09:19 pm
GT bias toolClayton Choate04-25-06  12:11 pm
Repair / Maintenance questionsWarren Peace04-26-06  01:00 pm
2x12 Sixty Five Bias/Tube Questionbradleyny05-05-06  08:12 am
Problems with biasing my HD130dennis v05-10-06  06:21 am
Reverb gone on the HD130 Head...off EBayBrian M. Watson 09-16-10  10:09 am
Another Endorsement for Terry LooseMark Lewis 02-05-08  09:40 am
Help! My 112 Sixty-Five sounds badBrian Beebe 05-29-06  10:24 pm
Ideas on making an RD50 less trebley?Chris Metcalfe 10-26-06  12:40 pm
212 HD130 sounding too compressed.Steve Kennedy 06-25-06  01:31 am
When do you get preamp distortion ??Andrew Wilson 11-12-06  01:23 pm
Testing for Microphonic TubesEdward Solberg 07-02-06  10:16 am
It's broke--RD112-100William Nexson 08-13-06  10:41 am
Best sounding MusicMan amps?Mike Kaus 08-16-06  05:42 am
Problems with biasing my MM hd130Mike Kaus 09-14-06  06:25 am
RD50 intermittent fault/ recappingMike Kaus 10-16-06  12:37 pm
MM design objectives - idle bias levelsChris Metcalfe 10-20-06  06:48 am
Preamp distortion...Help...Andrew Wilson 10 11-21-06  02:22 pm
MM HD 210 One Thirty Mike Kaus 11-16-06  06:26 am
Weird hum 410-65Walter Jowers 12-18-06  07:08 pm
Distortion Issue solved... I hopeJeremy Shaw 11-23-06  05:51 pm
Signal clipping at the PI tube ?Andrew Wilson 11 11-30-06  08:39 pm
Voltage info neededAndrew Wilson 11-28-06  11:55 am
Need a power switch for 130 headMike Kaus 12-25-06  03:24 pm
Faulty Speaker PlugPeter Maziar 12-20-06  09:19 am
General overhauling a 112RD50Dirk Wacker 02-13-07  03:52 am
Any service bulletins for 112RD50 ?Dirk Wacker 02-13-07  04:04 am
210-65 was buzzing B-adlyEdward Solberg 02-24-07  08:44 am
Reverb questionMike Kaus 04-04-07  06:09 pm
Trying to clean up my clean toneMike 05-30-07  10:13 pm
MUSIC MAN HD150 Power Transformergsonique 05-17-07  09:07 pm
Pulling 2 Tubes on a 210 HD 130Ingo Raven 07-24-07  03:57 am
MM HD 210-130 distortion tone problem???Andrew Wilson 07-18-07  08:38 pm
HD130 acting up again, any thoughts ???Edward Solberg 07-20-07  08:34 pm
Amp tech in the UK who knows these amps?Mike 06-27-07  10:44 am
Little Volume ControlTodd Gunby 01-15-08  11:51 am
What is wrong with my HD-130 headSteve Tarabokia 09-10-07  10:27 am
Amp from 1975. Does it need new caps?Giorgio 09-14-07  07:15 pm
Help ! Buzzing on RD112 100W comboJim Gaudoin 09-13-07  07:50 am
AwesomeKevin Kelley 09-16-07  07:38 pm
Most Helpfull Forum - Thanks Jim Wainwright 10-22-07  06:52 am
Intermittent tone dropMike Kaus 10-24-07  06:26 am
Deep Switch Won't WorkJeremy Mock 10-26-07  05:05 pm
Best Overdrive pedal for 210-65T.E. Price 11 10-13-10  10:38 pm
No sound with 210HD/130-12AX7Josue Roberto Lopez 16 04-17-08  11:34 am
Bias Settings for RD112 One HundredBill Traylor 02-26-08  02:59 am
Tech Advice: 1980-2008 MODS?Marc Mulay 02-27-08  07:06 am
Carbon Resistors in you Music ManPeter Maziar 04-07-08  05:09 pm
Why is my hd130 farting at me?Mike Kaus 04-17-08  06:12 am
HD1390210 picks up radio stationsMatthew Lehr 05-03-08  07:51 am
Volume QuestionBill Traylor 06-28-08  11:11 pm
. RD 112 50 - The resistor eaterTom Siegel 10 01-23-09  04:10 pm
Set the bias - replacing like tubes?Ben Moore 07-30-08  08:00 am
Stuck tremelo on 210HD-130Bill Traylor 09-20-08  02:45 am
Need help fixing my MM Sixty FiveMike Kaus 10-08-08  06:10 am
Happy HolidaysTom Siegel 01-24-09  02:59 pm
Bias creep on a RD65-112Mike Kaus 01-07-09  06:12 am
Help with some infoSean Flannery 10 05-20-10  02:40 pm
Blown Tube (?) On 112-65Mike Kaus 02-20-09  06:21 am
Problems with blown valve and fusesMike Kaus 02-22-09  08:42 am
RD100 115 reverb problemJohn Paonessa 03-09-09  07:59 am
Potentiometer for MMThomas Leong 17 04-06-09  05:39 am
Heavy Distortion on 2275-65Mael Bellec 04-03-09  08:12 am
HD130 SettingsDave Gossett 06-25-09  09:46 pm
Sixty-five Reverb-lessDaniel Hall 07-13-09  01:21 pm
1976 112 Sixty-five bias questionGiordano da Silva 07-22-09  04:32 pm
410 130 goes "bassy" after warming upMike Kaus 11-13-09  07:17 pm
HD 212 130 ,12ax7 . Bias findings.Graeme Wilton 11-29-09  04:00 pm
Noisy HD212Ed Goforth 12-12-09  06:18 pm
Amp repair success story (MM HD-130)Mike Kaus 12-08-09  09:20 am
Footswitch or Phasor Repair for 112 RP65Cliff Goodwin 12-15-09  11:32 am
Footswitch or Phasor Repair for 112 RP65Mike Kaus 12-17-09  03:38 pm
Hd 150 volume loss is confusing meLars Verholt 02-17-10  07:48 pm
HD One-Fifty Head Tone Control latencyBill Traylor 09-03-10  03:48 am
HD150 Pots dual? OP amps??? (with pics)Lars Verholt 09-30-10  10:43 pm
Perhaps I should give up...bias story.Brian M. Watson 10-05-10  11:23 am
HD130 Reverb (Reverb button not working)Adam 10-15-10  11:48 pm
RD combo cab rear panel orientationDavid Pokotylo 11-15-10  01:02 am
HD130 Channel JumpingAdam 11-23-10  03:58 am
HD130 - EL34 Tube RecommendationMike Kaus 11-09-11  04:17 pm
Schematic for 210RP One HundredAndy Simons 01-02-11  04:55 am
210-65 chassis number 2275-65 EXChristophe Servais 11 02-20-11  09:46 am
Coping with bias creep...Mike Griffin 02-28-14  12:46 pm
HD130 Chassis - Loose ScrewsMike Kaus 14 01-24-11  11:20 am
210RP One HundredLars Verholt 03-08-11  07:30 am
MusicMan RD50-112 QuestionPaul Johnson 19 04-03-13  06:06 pm
2475-130: Low volume + general upkeepMike Kaus 05-21-11  04:17 pm
MM 115-65 distorted tone--HELP!Keith Wilkes 07-29-11  09:16 am
Musicman 410-75 amp question....David Goldberg 08-05-11  05:25 pm
Overdriving/ distortionChristophe 09-15-11  09:25 am
Tone difference:tube/SS phase splitter?Daniel Westrick 10-31-11  07:58 pm
Headroom: 65 vs 100 vs 130/150Bill Traylor 11-03-11  06:52 pm
MM 75 Reverb?Mike Kaus 01-09-12  03:27 pm
No bias current on 210-65????Steve Daugherty 10 01-26-12  11:22 am
LM307H in front of 12ax7Mike Kaus 02-15-12  04:44 pm
My new(old) MM 210 65 and ??Mike Kaus 02-27-12  08:11 am
Almost there but need help! 210-65Mike Kaus 02-29-12  10:39 am
115RP is dying ?Philippe Backès 05-13-12  09:44 am
Played with the Bias, broke my 212 HDEddie Morin 07-01-12  10:57 pm
Replacing Driver Transistors (Help)Mike Kaus 10-25-12  06:30 pm
Totally Baffled now 2475-75spudmurphy 36 02-26-13  07:30 am
Re-Tubing and Biasing a HD130 head?jnewmark 12-07-12  07:20 am
Bias And Heat In HD130?Mike Kaus 12-15-12  04:09 pm
112RD 100 Reverb HissRob Flindall 10 01-08-13  06:34 pm
Very Noisy HD210-130 I just acquiredPeter Harvey 13 01-22-13  04:17 pm
RD-50 service & refurb - Where to start?Mike Kaus 02-20-13  05:13 pm
HD130 popping soundsTim Guiher 01-26-13  04:41 pm
Hiss in HD130 410Mike Kaus 02-13-13  02:29 pm
RD 2100 no biasMike Kaus 14 03-21-13  06:05 pm
New Tubes for HD150Stephen Phillipis 03-27-13  06:31 pm
212-65 power switch wiringMike Kaus 04-01-13  08:25 pm
Unstable 2100-65pspring 04-14-13  09:22 pm
112RD Volume lossNiall Madden 05-22-13  05:49 am
Bleeding Caps / servicing reminder.Rory Coupland 15 07-06-13  06:48 pm
Schematic help.Christophe 07-16-13  07:46 am
MM HD130 2100-130 QuestionsBrian Vargas 07-11-13  02:43 pm
Deep/Normal switch- how config'd?Rory Coupland 07-17-13  02:43 am
Schematic: wrong!?Rory Coupland 10 07-24-13  02:50 am
Speaker killing ampLennart Hedlund 14 08-12-13  04:47 pm
Verb help pleaseGus Castellucci 08-17-13  03:23 pm
New tube bias problem in a 210-65 Mike Kaus 08-17-13  06:06 am
Bias frustration on 210-65!!!Steve Kennedy 31 09-01-13  07:52 pm
RD-50 LayoutMike Kaus 08-26-13  07:56 am
Power tube flashMike Kaus 09-11-13  12:16 pm
Power wave when switching on MM hd130Mike Kaus 02-23-14  05:18 pm
Hi/Standby/Lo Switch PopMike Griffin 02-28-14  12:10 pm
Reverse Audio Taper Gain PotsMike Griffin 02-28-14  05:01 pm
Swapping IC's on a SS 212 Sixty-FiveMike Kaus 03-19-14  09:17 am
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