NAD 1300 preamp upgrades

[J!m]

The 1300 is a well-regarded preamp in stock trim. however, it's rather upgrade-friendly with a standard OpAmp (collection) for amplification. Nine of them in fact.

And they're crappy (by today's standards) NJM 2043's. We will replace these with Ti LM4562 OpAmps. Every published parameter is better, but noteable is CMRR at 120dB V 100dB; Slew rate of 20v/mS v 6v/mS. They are clean, fast and quiet. Pinout is the same, but supply voltage is a bit lower. I'm installing sockets while I'm doing the job in the unlikely event a better OpAmp is developed in my lifetime.

To do this, a couple Zener Diodes have to be changed from 20V to 17V. I'm replacing the power supply caps with higher voltage Panasonic electrolytics while I'm in the area. I'm not doing a full recap as it's unnecessary, and I want to study the schematic (attached) further and decide where I can use films in any audio areas. Plus, it's generally a good idea to limit the number of changes you make between testing; in case you screw something up...

Basically, taking a perfectly good preamp, and cutting it up.

 

[Bob Boyer]

I try to remind myself on the range and in between sessions - one change at a time. Evaluate, proceed.

It's hard.

 

[J!m]

 

[Gepetto]

View attachment 85810

Nobody can say you don't have any 'nads' now Jim

 

[J!m]

A better looking tape deck and floppy tonearm turntable still inbound…

This gray paint is really tricky to clean. Rub it too much and it glosses up. It’s matte and holds the finger oil but too much alcohol and it starts taking paint off. The red and white printing seems durable enough but the black is fragile. The tape deck and CD player both have some black on the gray and you have to be super careful.

I ended up repainting the cover for the tape deck and it’s not quite dark enough. But it’s better than the black over rust that was.

 

[Bob Boyer]

Good looking stack of NADs there, bud. Hope you can marry the best parts of the current and inbound decks.

I like it.

 

[62vauxhall]

In the early '70's a friend going to university was involved with putting a mens floor hockey team together. There was already a women's team. His suggestion for the team's name was the Nads.

The objective being that if the men's team ever played the women's team, men's team supporters would get to cheer them on with "Go Nads, go".

 

[J!m]

Need to change the stacking order so the large right hand knobs are together.

 

[marcok]

A better looking tape deck and floppy tonearm turntable still inbound…

This gray paint is really tricky to clean. Rub it too much and it glosses up. It’s matte and holds the finger oil but too much alcohol and it starts taking paint off. The red and white printing seems durable enough but the black is fragile. The tape deck and CD player both have some black on the gray and you have to be super careful.

I ended up repainting the cover for the tape deck and it’s not quite dark enough. But it’s better than the black over rust that was.

https://www.amazon.com/Birchwood-Ca...026688&sprefix=birchwood+,aps,237&sr=8-2&th=1
This product is perfect for NADs . Tested on my 4150 tuner .
Ciao
Marco

 

[J!m]

Do you have some pictures?

 

[marcok]

Pics are useless now ; I have no pics before treatment . Sorry .
Anyway there were little scretchs on the edges of the face plate .
Now I remember that I used this product on Tandberg TCD 320 ( black front )
Ciao
Marco

 

[marcok]

 

[marcok]

This is my NAD 4150
Ciao
Marco