Adding Lar-Mar type II master volume to my Rocket
Moderators: pompeiisneaks, Colossal
Adding Lar-Mar type II master volume to my Rocket
After converting my Liverpool over to a Rocket I am left with an extra hole in the front panel so I am going to add the Lar-Mar type II master volume. Since this circuit is cathode biased, are the two 2M resistors that are soldered across the 250k dual-gang pots still required ? They are there when this MV is installed in a fixed bias circuit as protection to the bias circuit should the wiper on the pot(s) fail but in a cathode biased circuit such as the Rocket, bias is not set there ....grid reference is. I have never done a MV before ( if you can believe that !) so I am taking things slow and carefull
Re: Adding Lar-Mar type II master volume to my Rocket
There is no difference installing a Lar-Mar or PPIMV on the Rocket cathode bias verses Express fixed bias.
I use a 250k Liner dual gang pot, 2m2 resistors (2) and shielded cable to power tube grids and bias caps where the two 220k resistors used to be. Out of the dual pot to ground.
I use a 250k Liner dual gang pot, 2m2 resistors (2) and shielded cable to power tube grids and bias caps where the two 220k resistors used to be. Out of the dual pot to ground.
Re: Adding Lar-Mar type II master volume to my Rocket
I thought so but wanted to get confirmation....thank you Sir
Re: Adding Lar-Mar type II master volume to my Rocket
No problem glad to help out.
Here is a Rocket combo thread with a nice layout showing how he wired his. http://ampgarage.com/forum/viewtopic.ph ... hanneedles
http://ampgarage.com/forum/download/fil ... &mode=view
Here is a Rocket combo thread with a nice layout showing how he wired his. http://ampgarage.com/forum/viewtopic.ph ... hanneedles
http://ampgarage.com/forum/download/fil ... &mode=view
Re: Adding Lar-Mar type II master volume to my Rocket
I only have 2M resistors on hand.....NOT 2.2M but I would think it won't be an issue. WOW !.....that layout is freaking NICE ! Lots of cool mods going on
Re: Adding Lar-Mar type II master volume to my Rocket
I've built so many Rockets and some I've added three switches just for fun.
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Re: Adding Lar-Mar type II master volume to my Rocket
the larmar is perfect for ac30 type amps w/o negative feedback. it works great
www.myspace.com/20bonesband
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Express, Comet 60, Jtm45, jtm50, jmp50, 6g6b, vibroverb, champster, alessandro rottweiler
4x12" w/H75s
www.myspace.com/prostitutes
Express, Comet 60, Jtm45, jtm50, jmp50, 6g6b, vibroverb, champster, alessandro rottweiler
4x12" w/H75s
Re: Adding Lar-Mar type II master volume to my Rocket
Installed the LAR-MAR PPIMV and really like it I also set my signal caps to .022uf to reduce the low end a tad and dropped the input cap on the PI to .01uf to smooth out the drive. This ones done folks.....sounds FANTASTIC
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Re: Adding Lar-Mar type II master volume to my Rocket
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Re: Adding Lar-Mar type II master volume to my Rocket
Looks very good.
Re: Adding Lar-Mar type II master volume to my Rocket
Congrats - very nice build. They can be loud so a PPIMV helps a lot for lower volume situations.
I understand about the Liverpool not being your thing. Not really a pedal friendly platform either, whereas the Rocket is a great pedal platform.
The Liverpool is on the edge of stability when it sounds great.
Well done!
I understand about the Liverpool not being your thing. Not really a pedal friendly platform either, whereas the Rocket is a great pedal platform.
The Liverpool is on the edge of stability when it sounds great.
Well done!
Why Aye Man