MajorNut JCM 800 Build. - Page 4

MajorNut1967 · 10-30-2009, 12:45 PM

Quote:

Originally Posted by belch

I find it easier & much neater to use teflon coated wire twisted with a drill for the heaters, it stays where it's put due to the extra rigidity.

Still a pain in the arse though, just had to do a 9005.

Oh boy loads fun there!

Wilder Amplification · 10-30-2009, 01:18 PM

Quote:

Originally Posted by MajorNut1967

Hey Jon,

Do you use your drill to twist your AC fil wries? sounds like you are getting close fire up time?

I think the JTM deserves P2P board. I don't use carbon comps unless the customer demands them, too noisy. Did they request the Sozo caps or is that just what you use? I don't know why Marshall upped the cap values, an of the shelf RI don't even sound like a 45! Sounds more JTM 50'ish. are going to return to the old values on the first cathode & the tone stack ?

Actually no, I twist them by hand believe it or not.

In regards to the Bluesbreaker, the customer requested the carbon comps and the Sozo caps. I personally prefer the carbon film resistors and Sozo caps, but I can do whatever the customer wants. Everything is being done as per the original schematic with exception of the trem circuit of course.

MajorNut1967 · 10-30-2009, 01:26 PM

Quote:

Originally Posted by Wilder Amplification

Actually no, I twist them by hand believe it or not.

In regards to the Bluesbreaker, the customer requested the carbon comps and the Sozo caps. I personally prefer the carbon film resistors and Sozo caps, but I can do whatever the customer wants. Everything is being done as per the original schematic with exception of the trem circuit of course.

Ya I still love my Mallory 150's But I had to use SBE's for my .022 mfd on this amp.

MajorNut1967 · 10-31-2009, 03:14 AM

Well it's up and running! Sounds ok, I want up the gain more in a few stages. UMMMMM that new amp smell. Ok plates are steady @ 466vdc drawing
76.4mA per side. Bias voltage is -41.6vdc. The bottom end is thunderous, but not flubby, very defined. Top end is very bright, might be the power tubes. Distorts very smoothly, almost not typical Marshall midrange honk; I used a
56k slope resistor not the normal 33k. going to by-pass the 820 using a switch & .68mfd, used a .68mfd on the presence POT; nice and glassy. will get more pics up later.

Cheers guys!

Wilder Amplification · 10-31-2009, 09:04 AM

Quote:

Originally Posted by MajorNut1967

Well it's up and running! Sounds ok, I want up the gain more in a few stages. UMMMMM that new amp smell. Ok plates are steady @ 466vdc drawing
76.4mA per side. Bias voltage is -41.6vdc. The bottom end is thunderous, but not flubby, very defined. Top end is very bright, might be the power tubes. Distorts very smoothly, almost not typical Marshall midrange honk; I used a
56k slope resistor not the normal 33k. going to by-pass the 820 using a switch & .68mfd, used a .68mfd on the presence POT; nice and glassy. will get more pics up later.

Cheers guys!

Major...with that 56K slope resistor...don't forget that max plate dissipation for EL34s is 35+ watts so make sure and bias it at 87mA per power valve...THIS IS VERY CRITICAL! If you don't, you're a bloody wanker!

*'major' sarcasm*

Seriously...glad to here you got her running. I got about 95% of the chassis wiring complete on this Super Lead build...wish I could find my damn camera. She's lookin' great and can't wait to hear it.

MajorNut1967 · 10-31-2009, 11:08 AM

Quote:

Originally Posted by Wilder Amplification

Major...with that 56K slope resistor...don't forget that max plate dissipation for EL34s is 35+ watts so make sure and bias it at 87mA per power valve...THIS IS VERY CRITICAL! If you don't, you're a bloody wanker!

*'major' sarcasm*

Seriously...glad to here you got her running. I got about 95% of the chassis wiring complete on this Super Lead build...wish I could find my damn camera. She's lookin' great and can't wait to hear it.

You bloody bastard LOL

6

PaoloJM · 10-31-2009, 12:32 PM

Quote:

Originally Posted by MajorNut1967

Well it's up and running! Sounds ok, I want up the gain more in a few stages. UMMMMM that new amp smell. Ok plates are steady @ 466vdc drawing
76.4mA per side. Bias voltage is -41.6vdc. The bottom end is thunderous, but not flubby, very defined. Top end is very bright, might be the power tubes. Distorts very smoothly, almost not typical Marshall midrange honk; I used a
56k slope resistor not the normal 33k. going to by-pass the 820 using a switch & .68mfd, used a .68mfd on the presence POT; nice and glassy. will get more pics up later.

Cheers guys!

How did I not see this yet?!?!?!?
Congrats on your build Major, looks sweet, can't wait to hear clips.
If I could suggest that you leave the amp as is and play it for a couple of weeks. This is to allow everything to settle and burn in a bit so that the true tone comes out. Then start making decisions on whether it needs less highs, more gain etc.
You might be suprised at how much the tone could change, you don't want to tame highs now and find you want them back in two weeks time.

I'm eventually beginning design work on my Mark II amp, the 100 watt version of the 16 Watter I designed earlier in the year. Looking forward to bouncing ideas off you if you don't mind?

MajorNut1967 · 10-31-2009, 03:58 PM

Quote:

Originally Posted by PaoloJM

How did I not see this yet?!?!?!?
Congrats on your build Major, looks sweet, can't wait to hear clips.
If I could suggest that you leave the amp as is and play it for a couple of weeks. This is to allow everything to settle and burn in a bit so that the true tone comes out. Then start making decisions on whether it needs less highs, more gain etc.
You might be suprised at how much the tone could change, you don't want to tame highs now and find you want them back in two weeks time.

I'm eventually beginning design work on my Mark II amp, the 100 watt version of the 16 Watter I designed earlier in the year. Looking forward to bouncing ideas off you if you don't mind?

I will take you up on letting her settle for a week. It sounds great, these EH tube are very bright though. The only thing i really want to do now is by-pass the 820ohm with a .68mfd thats all more umffffffffff! love to hear your Idea's don't hesitate!

Wilder Amplification · 10-31-2009, 04:02 PM

Quote:

Originally Posted by MajorNut1967

I will take you up on letting her settle for a week. It sounds great, these EH tube are very bright though. The only thing i really want to do now is by-pass the 820ohm with a .68mfd thats all more umffffffffff! love to hear your Idea's don't hesitate!

You can also place a 1M resistor in series with that 0.68uF and have a switch that shorts/unshorts across the resistor so that you can switch it in and out if you like both sounds.

MajorNut1967 · 10-31-2009, 04:09 PM

More testing stage Photos.

MajorNut1967 · 10-31-2009, 06:49 PM

Well I just spent two hours with JCM 800 clone and I am very pleased to say the least with my 72' Strat get a great Trower sound. We taking it down to the studio to record it so you blokes can hear it.

Wilder Amplification · 10-31-2009, 06:55 PM

Quote:

Originally Posted by MajorNut1967

Well I just spent two hours with JCM 800 clone and I am very pleased to say the least with my 72' Strat get a great Trower sound. We taking it down to the studio to record it so you blokes can hear it.

In that case if you've got a Univibe I'd kill to hear a Bridge Of Sighs clip.

MajorNut1967 · 10-31-2009, 11:18 PM

Quote:

Originally Posted by Wilder Amplification

In that case if you've got a Univibe I'd kill to hear a Bridge Of Sighs clip.

I do have a Uni-Vibe and I will do it for you Bro.

MartyStrat54 · 10-31-2009, 11:33 PM

Oh...I thought you were going to use the EH6CA7's, but I see you got the EL34's. Yeah, those are on the bright side. Hell a pro like you can tweak the cap values to make these sound good. Love that output jack.

MajorNut1967 · 10-31-2009, 11:46 PM

Quote:

Originally Posted by MartyStrat54

Oh...I thought you were going to use the EH6CA7's, but I see you got the EL34's. Yeah, those are on the bright side. Hell a pro like you can tweak the cap values to make these sound good. Love that output jack.

LOL still testing and the IMP switch ain't here yet remember I live in the middle of the water.

HOT TUBES 70 · 11-01-2009, 11:10 AM

fuck !! you guys do nice work !!
what will this amp sound like when done ? plexi tone etc ?

MajorNut1967 · 11-01-2009, 01:14 PM

Quote:

Originally Posted by HOT TUBES 70

fuck !! you guys do nice work !!
what will this amp sound like when done ? plexi tone etc ?

Hey Tubes,

Thanks! This amp sounds more early JCM 800, bu I have done some other thing to it to give it its own character. So if you roll-off the guitar volume it cleans right up and I modded the grid 3 connections. so if you back off the gain it sounds more like a Model 1959 as far as sounding Plexi not really. I am recording today so I will have samples later.

MajorNut1967 · 11-01-2009, 01:30 PM

Quote:

Originally Posted by MartyStrat54

Oh...I thought you were going to use the EH6CA7's, but I see you got the EL34's. Yeah, those are on the bright side. Hell a pro like you can tweak the cap values to make these sound good. Love that output jack.

ya Marty I am using the EH 6CA7's but the aren't here. And I had this set of EH EL34's just to play with.

MartyStrat54 · 11-01-2009, 03:36 PM

Quote:

Originally Posted by MajorNut1967

ya Marty I am using the EH 6CA7's but the aren't here. And I had this set of EH EL34's just to play with.

Well based on what I hear you say, I think you will be happier with the 6CA7's. I'm looking at another quad of double pan getter 6CA7's for $300. The price for used tubes has gone up sharply in the past several months. I have no idea of what is causing this.

MajorNut1967 · 11-01-2009, 08:51 PM

Quote:

Originally Posted by MartyStrat54

Well based on what I hear you say, I think you will be happier with the 6CA7's. I'm looking at another quad of double pan getter 6CA7's for $300. The price for used tubes has gone up sharply in the past several months. I have no idea of what is causing this.

Thank you Marty for the info! I have heard a lot of guys chirping about the EH 6CA7 with good thoughts.

MajorNut1967 · 11-01-2009, 09:45 PM

Sorry guys no samples of the Amp tonight, the ADAT broke wouldn't sync. Later in the week for samples

Wilder Amplification · 11-01-2009, 10:48 PM

Quote:

Originally Posted by MajorNut1967

Sorry guys no samples of the Amp tonight, the ADAT broke wouldn't sync. Later in the week for samples

Lemme guess...you were trying to get the tone from Black Dog by overdriving the input of it.

MajorNut1967 · 11-01-2009, 11:49 PM

Quote:

Originally Posted by Wilder Amplification

Lemme guess...you were trying to get the tone from Black Dog by overdriving the input of it.

LOL Get buggerd Mate!

PaoloJM · 11-02-2009, 08:25 AM

Quote:

Originally Posted by MajorNut1967

Sorry guys no samples of the Amp tonight, the ADAT broke wouldn't sync. Later in the week for samples

Surely a man of your skills and capability could fix it?

Make with the clips already, I'm dying to hear it!!

MajorNut1967 · 11-02-2009, 11:38 AM

Quote:

Originally Posted by PaoloJM

Surely a man of your skills and capability could fix it?

Make with the clips already, I'm dying to hear it!!

You guys really think I can fix anything? And that put's pressure on me and I don't do well under PRESSURE! lol

MajorNut1967 · 11-02-2009, 04:22 PM

Here guys, here's a shitty demo of the amp we blew up one of my vintage SM57's recording this so the sound quality is crappy.
The recording is direct into the mixer direct into the tape no effects no nothing.

This is for crazy Jon

http://members.cox.net/ironmangoamps.../trowerJON.mp3

Jesstaa · 11-02-2009, 06:15 PM

Ugh, can't download in google chrome. Don't even wanna touch IE8

MajorNut1967 · 11-02-2009, 08:36 PM

Is any one else having trouble play the file?
OK I GOT A NEW LINK!

http://members.cox.net/ironmangoamps.../trowerJON.mp3

Wilder Amplification · 11-02-2009, 11:09 PM

Quote:

Originally Posted by MajorNut1967

Is any one else having trouble play the file?
OK I GOT A NEW LINK!

http://members.cox.net/ironmangoamps.../trowerJON.mp3

Piss drinking wannabe Aussie huh?

Great fuckin' clip by the way.

MajorNut1967 · 11-02-2009, 11:20 PM

Quote:

Originally Posted by Wilder Amplification

Piss drinking wannabe Aussie huh?

Great fuckin' clip by the way.

I'm just playing mate, I wouldn't insult you like that for true.

Well I really need to apologize for the sad playing, unfortunately I work on them better then I play them. But I will do some clips with humbuckers tomorrow. I went and bought a new SM57 today.

10-31-2009, 03:14 AM	#94 (permalink)
MajorNut1967 Senior Member Join Date: Jul 2009 Location: South Pacific Posts: 710	Re: MajorNut JCM 800 Build. Well it's up and running! Sounds ok, I want up the gain more in a few stages. UMMMMM that new amp smell. Ok plates are steady @ 466vdc drawing 76.4mA per side. Bias voltage is -41.6vdc. The bottom end is thunderous, but not flubby, very defined. Top end is very bright, might be the power tubes. Distorts very smoothly, almost not typical Marshall midrange honk; I used a 56k slope resistor not the normal 33k. going to by-pass the 820 using a switch & .68mfd, used a .68mfd on the presence POT; nice and glassy. will get more pics up later. Cheers guys! __________________ MJN1967 aka BA (Bad Attitude) 1968 model 1987 50watt. A Baby Major (Half-Power) I built from the ground up. JTM 45 Clone combo Ground up build. JCM 800 Clone Ground up build. Custom Built Warmoth Strat 75' Fender Tele-Deluxe '70 style strat custom build w/Custom Shop 69's PU's

10-31-2009, 04:09 PM	#100 (permalink)
MajorNut1967 Senior Member Join Date: Jul 2009 Location: South Pacific Posts: 710	Re: MajorNut JCM 800 Build. More testing stage Photos. __________________ MJN1967 aka BA (Bad Attitude) 1968 model 1987 50watt. A Baby Major (Half-Power) I built from the ground up. JTM 45 Clone combo Ground up build. JCM 800 Clone Ground up build. Custom Built Warmoth Strat 75' Fender Tele-Deluxe '70 style strat custom build w/Custom Shop 69's PU's

10-31-2009, 06:49 PM	#101 (permalink)
MajorNut1967 Senior Member Join Date: Jul 2009 Location: South Pacific Posts: 710	Re: MajorNut JCM 800 Build. Well I just spent two hours with JCM 800 clone and I am very pleased to say the least with my 72' Strat get a great Trower sound. We taking it down to the studio to record it so you blokes can hear it. __________________ MJN1967 aka BA (Bad Attitude) 1968 model 1987 50watt. A Baby Major (Half-Power) I built from the ground up. JTM 45 Clone combo Ground up build. JCM 800 Clone Ground up build. Custom Built Warmoth Strat 75' Fender Tele-Deluxe '70 style strat custom build w/Custom Shop 69's PU's

10-31-2009, 11:33 PM	#104 (permalink)
MartyStrat54 Senior Member Join Date: Feb 2009 Location: Formerly Phoenix, now north of KC Posts: 2,583	Re: MajorNut JCM 800 Build. Oh...I thought you were going to use the EH6CA7's, but I see you got the EL34's. Yeah, those are on the bright side. Hell a pro like you can tweak the cap values to make these sound good. Love that output jack. __________________ MARTY 2009 Gibson Explorer-Hell Raising Machine 1989 Fender Strat Plus USA 2008 Fender Tele USA 2004 Schecter Elite w/DiMarzio's TSL100 with custom 4x12 cab. TSL122 with Man 'O War Speakers. TSL602 #1 with JBL D123 Speakers and 602 #2 with Altec 417 Speakers. "Oh so sweet my friends." DSL401 #1 with Red Fang Speaker and 401 #2 with JBL D123 Speaker. Tubes: Let's just say they are NOS that kick ass.

11-01-2009, 11:10 AM	#106 (permalink)
HOT TUBES 70 Senior Member Join Date: Oct 2008 Location: SASKATOON Posts: 1,675	Re: MajorNut JCM 800 Build. fuck !! you guys do nice work !! what will this amp sound like when done ? plexi tone etc ? __________________ MARSHALL 6100LM MARSHALL 1960A W/-G12H 30's CUSTOM BUILT 2X12 W/-V30's "MARSHALL" - only the best will do !

11-01-2009, 09:45 PM	#111 (permalink)
MajorNut1967 Senior Member Join Date: Jul 2009 Location: South Pacific Posts: 710	Re: MajorNut JCM 800 Build. Sorry guys no samples of the Amp tonight, the ADAT broke wouldn't sync. Later in the week for samples __________________ MJN1967 aka BA (Bad Attitude) 1968 model 1987 50watt. A Baby Major (Half-Power) I built from the ground up. JTM 45 Clone combo Ground up build. JCM 800 Clone Ground up build. Custom Built Warmoth Strat 75' Fender Tele-Deluxe '70 style strat custom build w/Custom Shop 69's PU's

11-02-2009, 04:22 PM	#116 (permalink)
MajorNut1967 Senior Member Join Date: Jul 2009 Location: South Pacific Posts: 710	Re: MajorNut JCM 800 Build. Here guys, here's a shitty demo of the amp we blew up one of my vintage SM57's recording this so the sound quality is crappy. The recording is direct into the mixer direct into the tape no effects no nothing. This is for crazy Jon http://members.cox.net/ironmangoamps.../trowerJON.mp3 __________________ MJN1967 aka BA (Bad Attitude) 1968 model 1987 50watt. A Baby Major (Half-Power) I built from the ground up. JTM 45 Clone combo Ground up build. JCM 800 Clone Ground up build. Custom Built Warmoth Strat 75' Fender Tele-Deluxe '70 style strat custom build w/Custom Shop 69's PU's Last edited by MajorNut1967; 11-02-2009 at 08:59 PM.

11-02-2009, 06:15 PM	#117 (permalink)
Jesstaa Senior Member Join Date: Apr 2009 Location: Gippsland, Vic, Australia. Posts: 797	Re: MajorNut JCM 800 Build. Ugh, can't download in google chrome. Don't even wanna touch IE8 __________________ GEAR LIST Marshall JCM900 4100 (6L6) (1995) Marshall Valvestate 1965A cab (????) Cort VX-2V (2008) TUBES/SPEAKERS Power: Groove Tube 6L6GCB Phase Inverter: Sovtek 7025 Pre: V1 - N.O.S Mullard ECC83. V2 National 12AX7A Speakers: Celestion G10L-35 Marshall forever My tube amp & Real Music appreciation forum

11-02-2009, 08:36 PM	#118 (permalink)
MajorNut1967 Senior Member Join Date: Jul 2009 Location: South Pacific Posts: 710	Re: MajorNut JCM 800 Build. Is any one else having trouble play the file? OK I GOT A NEW LINK! http://members.cox.net/ironmangoamps.../trowerJON.mp3 __________________ MJN1967 aka BA (Bad Attitude) 1968 model 1987 50watt. A Baby Major (Half-Power) I built from the ground up. JTM 45 Clone combo Ground up build. JCM 800 Clone Ground up build. Custom Built Warmoth Strat 75' Fender Tele-Deluxe '70 style strat custom build w/Custom Shop 69's PU's

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