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Author Topic: Herby's attemt @ SS Mod, Noise Mod, MDRT Mod  (Read 5789 times)

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herbyguitar

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Re: Herby's attemt @ SS Mod, Noise Mod, MDRT Mod
« Reply #30 on: Time Format »

Anyone need an MP1 for parts?
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MarshallJMP

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Re: Herby's attemt @ SS Mod, Noise Mod, MDRT Mod
« Reply #31 on: Time Format »

Wow Herby, don't give up so easy, this can be fixed, doesn't seem to be so bad.I've seen far worse then this. Maybe we can do a skype session next week so I can help you out finding the problem.Do you have a multimeter?
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herbyguitar

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Re: Herby's attemt @ SS Mod, Noise Mod, MDRT Mod
« Reply #32 on: Time Format »

I sent you an email explaining what happened.
I'm an idiot!!!
When I started this project I unplugged the large ribbon cable to gain access to the large caps. I was so preoccupied with installing everything and then messing up the IC socket that when I tested the MP1 with only the noise mod installed I forgot all about the ribbon cable. This morning I tried it again and it still didn't work so I put it back on the work bench and was staring at it in disgust when my eyes wandered over to the large socket where the ribbon cable was supposed to go. It was empty...   :facepalm:

I reattached the cable, plugged in the MP1, and guess what? IT FRIKKIN WORKS!!!! I spent the next 20 minutes jammin :banana-guitar:

I hope I'm not the only one to ever make a stupid mistake   :o

So now, it's on to the MDRT mod and then the tube board SS mod
« Last Edit: Time Format by herbyguitar »
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herbyguitar

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Re: Herby's attemt @ SS Mod, Noise Mod, MDRT Mod
« Reply #33 on: Time Format »

New transformer is in. No troubles. All is well. This was simple. I like simple ^-^
« Last Edit: Time Format by herbyguitar »
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Kim

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Re: Herby's attemt @ SS Mod, Noise Mod, MDRT Mod
« Reply #34 on: Time Format »

Yes they are a PITA.  It's a slow process that requires a bit of patience....not like installing them at the factory when everything can just be wave soldered and go, that's for sure.

If you think you might want to send it to someone to get that sorted, I may be available to do that.  I'm in Wisconsin, btw.
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herbyguitar

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Re: Herby's attemt @ SS Mod, Noise Mod, MDRT Mod
« Reply #35 on: Time Format »

Thanks for the offer Kim. I just finished everything.

Verdict: ... IT'S ALIVE!!!   >:D

Just finished testing. I cranked it up and put OD1 and OD2 both on 10. It's quiet and cleaned up very well. Just enough gain for metal and my SC strat. Kept all those nice overtones as well. It's like it cut the distortion but kept everything else. I'm very pleased.

Now all I need is a gate for the back end. Actually... I may not even need a gate on the back side. I should be set and running by next weekend   8)

[edit] Last questions:
1) Is there any adjustments I should do with the internal trim pots?
2) On the tube board, which sockets are V1, V2?
« Last Edit: Time Format by herbyguitar »
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Systematic Chaos

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Re: Herby's attemt @ SS Mod, Noise Mod, MDRT Mod
« Reply #36 on: Time Format »

Congrats!
V1 is the closest tube to the front, V2 the other.
Check the Stock Gain Mod instructions for the OD Trimpot (T2) adjustment:
Step 10: Tweaking the OD1 Trimpot
Here is how to set the input stage gain-trim:
1) Plug your MP-1 back into your rack, make sure you have ample access to the top of the unit.
2) Locate the OD1 Trimpot you replaced in steps 6 & 7.
3) Dial-up your favorite high-gain patch.
4) Grab your main axe, plug it in, and switch to your bridge pickup.
5) Set the OD1 Level Control to 5.0 or 6.0 (or 7.0 depending on your pickups). You will have to play
around with this setting until you are happy with how the other channels sound, especially the Clean-
Tube channel. I wouldn’t let this setting get above 8.0, it may get too muddy or noisy.
6) While you are doing palm mutes and/or heavy open chords (“Pull Me Under” is a good riff to test
with BTW), have your little brother turn the trimpot dial with a little miniature screwdriver until the
OD1 Clipping LED lights up frequently on downstrokes, but doesn't stay lit all the time.
« Last Edit: Time Format by Systematic Chaos »
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Iperfungus

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Re: Herby's attemt @ SS Mod, Noise Mod, MDRT Mod
« Reply #37 on: Time Format »

You scared me a lot mate!  :lol:

I've to replace some caps and one IC on my MP-1...  :lol: :lol: :lol:

Now I know I've to pay attention to ribbon cables connectors!  :banana:
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MarshallJMP

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Re: Herby's attemt @ SS Mod, Noise Mod, MDRT Mod
« Reply #38 on: Time Format »

Yep without the ribbon cable the mp-1 won't fire up, that's normal.
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herbyguitar

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Re: Herby's attemt @ SS Mod, Noise Mod, MDRT Mod
« Reply #39 on: Time Format »

Well??? I could have lied about it   :dunno:
Anyway. I'm documenting the trials and tribulations of a novice Electronics Technician and possibly giving good (what not to do) advice :P
The 3 mods were actually very easy, suffer a few burns and that pesky little opamp...

I'd like to try some different tubes. I've got JJ ECC 83s in both V1 and V2. They sound good with a lot of gain but a little dull. I'd like to keep one of them and change out the other. The 2 below have been highly recommended.
Mullard  ECC83 / 12AX7 long plate.
Mullard CV4004 / 12AX7 short plate.

What is the difference in gain?
Which tube is going to give me a more articulate low end?
Which slot to change, V1 or V2?
« Last Edit: Time Format by herbyguitar »
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Systematic Chaos

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Re: Herby's attemt @ SS Mod, Noise Mod, MDRT Mod
« Reply #40 on: Time Format »

For articulate low end put a TAD RT001 (12AX7A-C) in V1 and one of the Mullards in V2. V1 (in combination with the OpAmp in U4) sets about 80% of your gain characterics/tone. V2 amplifies that and adds the icing on the cake.
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rnolan

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Re: Herby's attemt @ SS Mod, Noise Mod, MDRT Mod
« Reply #41 on: Time Format »

The long plate Mullard is a bit more 3D than the short plate and really articulate (nice) low end.  Careful though, the long plates are so subtle they track every little pressure change in your fretting  >:D . They are very articulate tubes.
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herbyguitar

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Re: Herby's attemt @ SS Mod, Noise Mod, MDRT Mod
« Reply #42 on: Time Format »

I've got one each coming.

Mullard  ECC83 / 12AX7 (long plate)
TAD RT001 (12AX7A-C)

Thanks guys for the input.
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Systematic Chaos

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Re: Herby's attemt @ SS Mod, Noise Mod, MDRT Mod
« Reply #43 on: Time Format »

You won't be disappointed!
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rnolan

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Re: Herby's attemt @ SS Mod, Noise Mod, MDRT Mod
« Reply #44 on: Time Format »

You won't be disappointed!
+1  :thumb-up:
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