Hi to everyone in the JVM Forum

Somewhere to introduce yourself ... NOT FOR DISCUSSION OF PROBLEMS - please discuss them in the relevant section not here !!!

Moderators: Dark Horse, jimsreynolds, Jackie, Andy

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Hi to everyone in the JVM Forum

Post by maxxs79 » Sat May 27, 2017 8:24 am

my Name is Markus and I live in Austria.
I got myself a used JVM205H some weeks ago and did already some rehearsals and one live gig with it.

I registered to become part of the group and to hopefully can solve some issues.
While the overdrive channel seems to work properly I wonder if the clean/crunch channel has a problem with the tone stage.
The sound in the clean/crunch channel has way to much bass and misses the sparkle and chiming hights that I love so much on my Marhshall Haze 15 amp.

I know, this is not the right place to discuss problems. Therefore I will start to search the forum.
Anyway if somebody had a similar problem or knows what the issue could be: I would be glad to get some hints!

Thanks a lot
Amps: JVM205H, Haze 15, Code 25, 5E3 Tweed Deluxe Clone, Roland MicroCube
Cabinets: JCM800 1960 Lead, 1936 Lead
Guitars: Gibson Les Paul Classic, Gibson SG Standard Bullion Gold, Fender Stratocaster, Blade Limited

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Re: Hi to everyone in the JVM Forum

Post by Codeman » Sat May 27, 2017 9:28 am

Welcome to the forum! I just got a used JVM205H as well.

As for your problem, I would say that the amp has probably had the stock tubes changed. Otherwise, I would say it is the difference in the cabs. I would look at the dedicated sections for both on this forum to get started.
'90 MIK Fender Telecaster
'17 Fender Strat Am. Professional HSS
'15 PRS SE Custom 24 "Floyd" 30th Anniversary Edition

Hotone Soul Press>Polytune Mini>Ego>OCD>BD-2>Maxon OD808>Morning Glory>MXR 6-Band>Keeley Super Mod>Source Audio Nemesis>RV-6

'13 Marshall JVM 205H
-Tubes: Preferred 7025, EH 12AX7, TAD 7025S, Svetlana 12AX7, JAN-GE 5751, Tung-Sol EL34B
-Cabinet: 1936V Loaded with G12H75 & G12M65
'14 Marshall DSL 40C
-Tubes: TAD7025WA, Mullard RI, Svetlana, Svetlana, TADEL34B-STR
-Speaker: G12H75

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Re: Hi to everyone in the JVM Forum

Post by namklak » Sat May 27, 2017 12:00 pm

Welcome to the use 205H club!
JVM205h. Added 100K from R94/C43 to ground for V1b (OD Channel) gain reduction. Installed 1000pF in series with 47K, in parallel with R58 (82K), to reduce power amp squeal. V3 Valve Wizard diode protection mod. Active power soak for more EL34 goodness.
Guitars: Angus Young Sig SG w/ Pearly Gates Neck and Custom Custom Bridge, Les Paul Special (2 pups) w/ SD Stacked P90s. And occasionally a Warmoth Strat w/ Dimarzio True Velvet in N, M, SD P-Rails in B.
HD500x in 4CM for all pedals and Midi control of 205h (grounds lifted on two of the signal cables).

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Re: Hi to everyone in the JVM Forum

Post by Dark Horse » Tue May 30, 2017 7:53 pm


JVM 410H w/Mods: 1µF Plexi Cap, 3H Mojotone Choke, Neg. Feedback Adj. Pot.(500K)

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