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A nice Marantz Model 1040 gets it's turn on the work bench

This Marantz Model 1040 has been sitting on the shelf for a while, waiting for its turn on the work bench. I really like the look of the 1040, the black panel with the silver faceplate reminds me of the earlier models Marantz made.

This 1040 is in very good condition and with just a little work it will be ready form another 20 years of great sounding music. My initial testing of the 1040 showed no problems with the amplifier, the sound quality was great and the controls are crisp and clean.

I used my usual cleaning method which includes a soft bristle brush and a vacuum cleaner to clear away most of the dirt. Then I followed up with a damp cloth on the more stubborn spots.

I like to start with the power supply board, which only has 4 capacitors to replace. There's a lot of space inside the 1040 and it would be a good model for a beginner to practice on.

As usual, the capacitors on the power supply board were glued to the circuit board with some type of adhesive. When the original capacitors are removed, there's a ring of adhesive left on the board.

Most of the adhesive can be pulled off the board or if your really careful, you can use a flat screw driver to scrape it off. You have to be careful to not scratch up the circuit board.

I used some acetone on a rag, which dissolves the adhesive with some light scrubbing. If you scrub to hard or for to long, you can scrub away the printing off the board.

The power supply board has some unusual components mounted on it. Inside the red box are the 4 rectifier diodes. These are model U05B diodes which are available from specialty suppliers for around $6.00 each. A good replacement would be a 1N5401.

The red arrow points to a small dual diode assembly which is a DS131B. This is simply 2 diodes in a single package. It can be replaced with 2 STTH1R02 diodes wired in series cathode to cathode.

With the power supply board completed, the tone board is next.

See all of the Model 1040 pictures here.

Reader Comments (19)

Would it be possible to get the power transistors?

I mean 2SA 837 and "SC 1667



May 14, 2013 | Unregistered CommenterFer

The only place I know to get original transistors is Little Diode in England and the transistors are super expensive.

My 1040 did not require output transistors, so I didn't look into what a modern substitute would be.


May 14, 2013 | Registered CommenterChris

Wow, that is a lot of work. Does all of this improve performance or simply keep the amp going?

I bought one of these new and it just started to hum (until it warms up). I gather this is a capacitor that is failing?

Mike in Victoria BC

February 23, 2014 | Unregistered CommenterMike Hill

Hi Mike,

While this Model 1040 did not have any serious problems, like all vintage amplifiers it was in need of some refurbishment to bring it back to its original condition.

After the working was completed there may have been some slight improvement in the overall sound of the amplifier, however this is always subjective.


February 24, 2014 | Registered CommenterChris

Hi Chris
What is the complete reference of the big capacitors on the photographs ?
I need change the same capacitors of my Marantz 1040.
Best regards.

October 17, 2014 | Unregistered CommenterJoseph

Hi Joseph,

The capacitors I used in the 1040 rebuild were Nichicon CE Series, which are no longer available. It looks like the replacement are the Nichicon KG Series.

You will need to check the dimensions of the new KG series to make sure that they will fit into the clamps and into the chassis correctly


October 18, 2014 | Registered CommenterChris

Hi Chris
Many thanks for your information.
Best regards from Spain

October 19, 2014 | Unregistered CommenterJoseph

Hi again Chris.Sorry,
the bigs capacitors of Marantz 1040 original volts value is 35
But you have replaced the news capacitors in 50 volts value.
Is important this difference or not ?
Many thanks for your patience.

October 27, 2014 | Unregistered CommenterJoseph

Hi Joseph,

It is perfectly acceptable to go up in Voltage (within reason) with capacitors.

I did this because the 50 volt capacitors are a larger diameter and they fit the original mounting clamps.


October 28, 2014 | Registered CommenterChris

Many thanks again Chris for your answers and patience.
Best regards from Spain.

October 28, 2014 | Unregistered CommenterJoseph

Hi Chris,please give me your opinion of these varistors found in Ebay for some Marantz models (1040)

Many thanks


October 29, 2014 | Unregistered CommenterJoseph

Hi Joesph,

I have no opinion about the varistors, Since they are from an unknown source there's no way to know anything about them except what the seller states. It's basically a total gamble if they are what's stated

October 31, 2014 | Registered CommenterChris

Hi Chris,i need to change in my Marantz 1040 amplifier the ceramic disc capacitor 3C KCK (3 PF 500 Volts) but donĀ“t find this.
Please,can you tell me the possible options for replace this component?
In this moment only i find in 4,7 PF reference value.
Another time many thanks for your patience.
I wish merry Christmas and happy new year 2015 for you and your family.
Best regards

December 6, 2014 | Unregistered CommenterJoseph

Hi Joseph,

Exactly which capacitor are you trying to replace? (which board, what part reference number)

December 6, 2014 | Registered CommenterChris

Hi Chris, many thanks.
The board is P 700 (Main Amplifier Assembly)
The reference in the service manual is :
C 707 DD 1003050 Ceramic 3 PF 500 V

December 6, 2014 | Unregistered CommenterJoseph

You could use an Vishay 561R10TCCV30BA. You will have to go up in voltage from 500 to 1000, however this does not present any problem in the circuit.

I would replace components in both channels.


December 7, 2014 | Registered CommenterChris

Hi Chris,many thanks for your time and information.
Best regards from Spain.

December 8, 2014 | Unregistered CommenterJoseph

I have a 1040 that's been with me for 20 odd years, it's now my garage amp, and I'd like to match it to a contemporary Marantz tuner and speakers. I'm am absolutely out of my league with you audiophiles so go easy!

It currently has no case is this something still available out there?

Any help would be greatly appreciated!


February 14, 2015 | Unregistered CommenterJason

Hi Jason,

The matching tuner for your model 1040 would be a Model 105 or 105B.

As for speakers it's always a difficult question. Your 1040 would work best with some efficient speakers, Nothing in the Marantz line jumps out at me, you will have to some additional research for speakers that suit your requirements.

Genuine wood case for your 1040 and a 105 are around if you look. I have several that are in good condition


February 15, 2015 | Registered CommenterChris

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