Marantz Model Twenty Five?

[galactech]

Hey all,

A few years ago, I got a Marantz Model Twenty Five off of a friend of mine when she moved out of her house. It was owned by their grandparents, who used to sell audio gear in the 70s.

Aside from my giddiness of finally being able to touch a Marantz, I was really excited to take it in and hopefully get to sounding like new. After dropping it off at the shop and patiently waiting, they were finally able to review it.

...Bad news. They said it was unfixable. They said that the parts were no longer available, and green mold, in other words: water damage. A real shame since its apparently the very first Marantz receiver, and has better specs than my current hear.

This is probably a stupid question rooted in my half-jest denial, but I was curious as to whether or not any of it CAN be salvaged. The right channel works, and it powers on ok, so I was shocked to hear it was completely kaput.

Any options?

 

[tonebells]

If you post some pictures of the damage and or the parts you are looking for it may help.

Tony

 

[foldthe]

I don't recall any parts in the Model 25 that cannot be sourced either new or NOS

 

[hjames]

One question @galactech - and no offense meant, how technical are you?
Are you capable/comfortable with using hand tools, meters and a soldering iron
to test and replace parts and dig into this on your own?

 

[57esquire]

I have the same problem, one set of Motorola transistors and one set of Toshiba transistors. I have not been able to find another set of Motorola's for the model 25. Any luck on your end, ToneBells?

 

[Lavane]

You could just replace them all with some new On-Semi's. I have an integrated amp with different brand outputs in one channel. I can't hear any difference between the two channels.

 

[galactech]

One question @galactech - and no offense meant, how technical are you?
Are you capable/comfortable with using hand tools, meters and a soldering iron
to test and replace parts and dig into this on your own?

Hey,

Truth be told, I'm not technical in the slightest. However, I am not a defeatist in that sense, and would be more than willing to learn since I nearly exclusively use vintage audio equipment.

 

[galactech]

If you post some pictures of the damage and or the parts you are looking for it may help.

Tony

@tonebells, this may not be very illuminating, but here are some photos. I'm a university student, so I was finally able to go home and take some photos. I am a complete newbie, and In my own, naive, uninformed opinion, it looks to be rather clean from a glance (probably off some work that he did, since this was sitting in a basement for a few decades).

I do see what he was talking about, i think, appears to be some mold, or maybe corrosion on leftmost side. Hopefully some cursory information can be gleaned from this. Thanks for any help.

 

[tonebells]

This a inside of a Model 26 that is from about the same time. You can see some of the same blue green crud on the same type of resister. This one had a blown channel. It sounded great when repaired. You are going to need someone better.

Tony

 

[tonebells]

I have the same problem, one set of Motorola transistors and one set of Toshiba transistors. I have not been able to find another set of Motorola's for the model 25. Any luck on your end, ToneBells?

I missed this. What are you looking for exactly?

Tony

 

[galactech]

You could just replace them all with some new On-Semi's. I have an integrated amp with different brand outputs in one channel. I can't hear any difference between the two channels.

@Lavane, I'm gonna ask the guy at my local record store for some advice on a good repair shop. Should I expect to ask them about using new On-Semi's?

 

[Lavane]

If on semi has an equivalent that will work, they should. Even with everything going up in price they still shouldn't break the bank. I tend to use that brand for Marantz and other various brands. You just want to order whatever you use from a reputable source like Mouser or Digikey.

 

[57esquire]

I missed this. What are you looking for exactly?

Tony

Hi, Tony. Sorry, for the delay. I guess I intended my message for "Galactech" but being a newbie myself, I'm not familiar with how the forums work...

I just re-capped my Model 25 with pretty good results but mine had a previous issue in the power amp. The cast resistors burned through the circuit board and took out the transistors on one side. The previous owner replaced the transistors and jumpered the circuit board to get it going again but one side definitely sounds better. So now I have the original Motorola's on one side and Toshiba's on the other. I offered to sell my Model 25 or buy Galactech's so, at least one of us can get a unit together. I understand, now, that offers to buy or sell can only be done through Barter Town. Mine has some other issues that are beyond me so, I'll gladly pass it on to more competent hands.

Thanks for the reply and sorry, for the miscue. Kind regards, Tim

 

[tonebells]

Hi, Tony. Sorry, for the delay. I guess I intended my message for "Galactech" but being a newbie myself, I'm not familiar with how the forums work...

I just re-capped my Model 25 with pretty good results but mine had a previous issue in the power amp. The cast resistors burned through the circuit board and took out the transistors on one side. The previous owner replaced the transistors and jumpered the circuit board to get it going again but one side definitely sounds better. So now I have the original Motorola's on one side and Toshiba's on the other. I offered to sell my Model 25 or buy Galactech's so, at least one of us can get a unit together. I understand, now, that offers to buy or sell can only be done through Barter Town. Mine has some other issues that are beyond me so, I'll gladly pass it on to more competent hands.

Thanks for the reply and sorry, for the miscue. Kind regards, Tim

I hope you all work it out. As stated before there is not much that cannot be found or fixed on these units. Just let us know what is needed,

Tony

 

[Lavane]

One of these came up for sale locally. One channel had the outputs replaced and that channel is weaker than the other. It had a decent TT on top too, but needs restoring.
Unfortunately the seller wants way too much for it. Its going to need a lot of work. If the price was right it would be worth my effort though.