MV3 modification

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MV3 modification

Postby Nikifena » 11 Mar 2008, 16:57

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
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Re: MV3 modification

Postby invalidcd » 11 Mar 2008, 17:42

wow, great work :applause:
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Re: MV3 modification

Postby AL » 11 Mar 2008, 17:51

:shock: Wow that was a lot of work. Nice job.

Once question - 6 ohm speaker jack?

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Re: MV3 modification

Postby Nikifena » 11 Mar 2008, 18:07

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.
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Re: MV3 modification

Postby analogguru » 11 Mar 2008, 18:28

guts and schematics of the original:
http://www.jogis-roehrenbude.de/Verstaerker/MV3.htm

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Re: MV3 modification

Postby AL » 11 Mar 2008, 20:04

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.

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Re: MV3 modification

Postby vince » 29 Jul 2008, 12:41

[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.
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Re: MV3 modification

Postby Zoltan » 20 Jul 2009, 11:56

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
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Re: MV3 modification

Postby RnFR » 20 Jul 2009, 12:50

wow! :shock: monster iron indeed!!!
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Re: MV3 modification

Postby DougH » 20 Jul 2009, 14:56

Beautiful work!

That's a cool looking amp. :wink:
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Re: MV3 modification

Postby Nikifena » 28 Jul 2009, 21:53

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.
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Re: MV3 modification

Postby juj0 » 31 Oct 2016, 13:28

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!
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Re: MV3 modification

Postby thereminator » 03 Dec 2016, 23:25

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