Luxman 3045 tube mono-blocks

[Fred Petersen]

I have achance to pick up a pair of Lux 3045 monoblock amps. Cosmetically they seem to be ok. However someone in the past tried to convert them to use el-34s connected in triode. The original out-put tube was designed specifically for this amplifier as well as the the out-put transformers by Tim Deparavicini of Esoteric audio Research. The info I'm looking for is 1. Is it still possible to find the output tubes (triodes) for this amp...and 2.I need to find a schematic for this circuit whether, I bring the amp back to stock(if posible), or I'm forced to find a substitute tube. Without a schematic I'm sunk. Is there any help out there? Thanks fastfreddd

 

[scottnixon]

Have a scheme for a 3045 with the factory mod for KT88 triode. It has all the stock info on it, the only addition is the two 100 ohm screen Rs and the voltage adjustments shown. It's the best copy I could make of the copy I have. I have the whole KT88 modifiaction 'manual' from Lux. I did a handful of amps in the early and mid 80s. I was a tech at a dealer then. Give me a email with a big box and I'll send a larger PDF of it. DIYaudio's limits the file size (rightfullyso!)

 

[Fred Petersen]

Luxman 3045 amp

Dear Scott: This is Fred. I tried to e-mail you but I'm not sure if it went through. If it did just ignore the rest of this message. I just wanted to thank you again, and to say I'll be sending you a new e-mail add. within the next few days. What a great idea the D.I.Y. audio forum is! And once again thanks Scott.

 

[imagefly208]

can you email me the kt88 pdf? my email imagefly2008@gmail.com

 

[Francis Jansz]

Mr:

Have a scheme for a 3045 with the factory mod for KT88 triode.

Please Send me a Copy of The Schematic Circuit for The LUXMAn MB 3045 And What Original Tubes was Previously used on This Model , As I am Planning to buy 2 MONO Blocks of The MB 3045 and Take out The Power OUTPUT Transformers and Install it on The Music Angel XDSe Amp to Use KT 88 Tubes any Help will help.
Kind Regards
Francis Jansz
e.mail: fsj@iprimus.com.au

 

[Francis Jansz]

I would like a Copy of The KT 88 Circuit for The LUXMAN MB3045 as well
Francis Jansz
e.mail: fsj@iprimus.com.au

 

[Palustris]

So your plan is to take the output transformers from a high quality classic amp and install them on a modern throw away Chinese POS amp?

 

[jazbo8]

I was thinking the same thing - something is wrong with this picture.

 

[rayma]

I need to find a schematic for this circuit whether, I bring the amp back to stock(if posible), or I'm forced to find a substitute tube.

The output tubes are long unavailable, as are the 6240G driver tubes. If the amps are very cheap, I'd still buy them IF the driver tubes work.
Some sub the 6FQ7/6CG7 for the drivers.

Check the pcbs for burned resistors, which are common, especially the 10 Ohm output bias current sensing resistors.

 

[Palustris]

That quote from Mr. Peterson is 13 years old!

I remain confident that it is possible to make some discrete changes to the Luxman amp to allow it to accept more common tubes and that breaking it up for parts is a mistake.

 

[multi]

The Luxman 3045 works very well with KT88's I have converted two.
Main problem with the 3045 is the very poor quality PCB's.
I had PCB's made as the original where full of shorts.
The Output transformer is very complicated best with the original circuit, very similar to a McIntosh. The Russian 6N6p should be a good replacement for the 6240G.
Breaking up the 3045 would be crazy one of the best amps ever made!!
Phil

 

[Chefjeff50]

Luxman 3045 pcbs

Do you have or can you make some extra PCBs you mentioned for the 3045s?
If so, plz reply. I have an opportunity to buy a pair with conversion already done and am looking to try and make them reliable as possible.
Thx,
Jeff

 

[liketowin]

a3045

Hi guys

I had sold a lot of A3000/3045, still got few pairs of them.

I have factory schematic of how to convert to KT88 from 8045g.

 

[multi]

I have scans of the PCB layout for the Luxman 3045 PCB's if any one is interested
I can email them.

 

[MOER]

3045

My dear friend Tim, with whom I "grew up" in South Africa has copied 90% of the McIntosh MC275.

The output tubes are extinct.

Using KT88 or other similar tubes the amplifier needs different bias points and drive signal.

Stephen Mantz

Zed Audio Los Angeles

 

[PhantomBox]

Hello Scottnixon.
I would like a copy of the KT 88 circuit for the LUXMAN MB-3045 as well.
I am trying to fix one of these, have the pair as reference. The power transformer has blown out and took all the diodes for the power supply with him.
I cannot find the original ones online. The power transformer has been rewound and installed, now I'm stuck with finding appropriate diodes that work. Any other parts I should pay attention to?
Thanks in advance.

Phantombox