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MV3 modification

Posted: 11 Mar 2008, 15:57
by Nikifena
Hi, just like to share my latest modification of a old german tube amplifier based over push-pull amplifier with two el84 tubes.

At the beginning this amplifier looks like this:
Image

and now it looks like this:
Image
Image

Re: MV3 modification

Posted: 11 Mar 2008, 16:42
by invalidcd
wow, great work :applause:

Re: MV3 modification

Posted: 11 Mar 2008, 16:51
by AL
:shock: Wow that was a lot of work. Nice job.

Once question - 6 ohm speaker jack?

AL

Re: MV3 modification

Posted: 11 Mar 2008, 17:07
by Nikifena
Thanks guys :horsey: :popcorn:

Yes AL. MV3 is a amplifier from VERMONA - a old german brand for amplifiers etc. Back in 80's they make 12 ohm speakers and they connect parallel two of them - this give exactly 6 ohm.

Output transformer have only one output section, and this is 6ohm.
But! (there is a goot new) ouptput transformer is verry good and have huge metal there and there is no problem to play with this am on 4 or 8 ohms.

Re: MV3 modification

Posted: 11 Mar 2008, 17:28
by analogguru
guts and schematics of the original:
http://www.jogis-roehrenbude.de/Verstaerker/MV3.htm

analogguru

Re: MV3 modification

Posted: 11 Mar 2008, 19:04
by AL
Nikifena wrote:Thanks guys :horsey: :popcorn:

Yes AL. MV3 is a amplifier from VERMONA - a old german brand for amplifiers etc. Back in 80's they make 12 ohm speakers and they connect parallel two of them - this give exactly 6 ohm.

Output transformer have only one output section, and this is 6ohm.
But! (there is a goot new) ouptput transformer is verry good and have huge metal there and there is no problem to play with this am on 4 or 8 ohms.
Wow that's really interesting (at least to me). I've never seen that brand. 8) Thanks

AG thanks for the link.

AL

Re: MV3 modification

Posted: 29 Jul 2008, 11:41
by vince
[quote="Nikifena"]Hi, just like to share my latest modification of a old german tube amplifier based over push-pull amplifier with two el84 tubes.
/quote]

I've got MV3 too! Great amp - I modify mine:
EF86 side - for Rt66 preamp
ECC83 side - for old Park preamp.
I've got old 6 Ohm RFT speaker - but cab is brand new.
I like this little DDR thing.

Re: MV3 modification

Posted: 20 Jul 2009, 10:56
by Zoltan
Hi Nikifena!

1/ poor MV3 amplifier only or "like MV3" amplifier :?: :?: :?:

2/ in MV3 case be specifical modification (channel with EF86 out) or full new DIY amp :?: :?: :?:

3/ assembled in original Vermona PCB or poor PCB or your own PCB or "space spider method": no pics interior case "MV3"... :cry:

In http://www.jogis-roehrenbude.de/Verstaerker/MV3.htm exist only MV3 pictures gallery - original pictures source & description without :twisted:

For original description MV3 please look to:

www.fonar.com.pl -> Galeria (Gallery) -> Wzmacniacz lampowy MV3 (Tube Amplifier MV3)

- in Polish language only but with description actualisation & new pics (all without in Jogis-Roehrenbude)

I be pics & description (in www.fonar.com.pl) author.

Regards, Zoltan

Re: MV3 modification

Posted: 20 Jul 2009, 11:50
by RnFR
wow! :shock: monster iron indeed!!!

Re: MV3 modification

Posted: 20 Jul 2009, 13:56
by DougH
Beautiful work!

That's a cool looking amp. :wink:

Re: MV3 modification

Posted: 28 Jul 2009, 20:53
by Nikifena
Dear Zoltan

This is a original MV3 german amplifier from Vermona.
I take it like a junk. without tube and broken.
I fix it using original PCB. Solder the socket, make better star ground. When the amplifier was working I just paint the enclouser, make a new frontpannel and change input and output sockets and knobs.
I use only channel 2 with ecc83 tube. I found, that the signal was a little bit distorted, and change the input tube with ecc82. Now I become better sound. I remember, that I make a little preamp modification, but this is old project, and I don't remember what I was make.

Re: MV3 modification

Posted: 31 Oct 2016, 12:28
by juj0
Hi Guys,

I know this is an old post, but I haven's seen any rule forbidding replying to such topics.

Please tell me how did you change the original DIN sockets to Jacks? I completely can not move them.

Thanks!

Re: MV3 modification

Posted: 03 Dec 2016, 22:25
by thereminator