The Amp Garage

Guts? Here you go

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Mike

I'm guessing that you have been able to turn it up by now. Any update on how it sounds?

Mike

Looks really good. Is that really a 3 amp fuse in there?

Mike

Beautiful job Ian. Did you start with the Tandy coax and then change to the Columbia because it sounded better? If so, what difference did you hear?

Mike

More details on the old Dumbles and the new amp here:

https://www.youtube.com/watch?v=B8xYLUYHli0

Thanks. I do appreciate hearing these stories.

Mike

Thanks Brandon. That clears a lot up.

Mike

Ian,

The big question is if you hear a difference with this amp now that is in the new chassis? Does it sound better or just "different"?

By the way, extremely clean and beautiful build (as usual). Definitely a reference build for me.

Mike

It would be great to have a list of dates and different suppliers for the NTE metal film resistors. I Imagin those are trade secrets that will never be released, but it would sure make it easier to find alternatives if we can't find the NTE packaged ones. Sorry Sergio about the new resistors. They d...

Beautiful build! Did you build a new board for the preamp? Looks pretty clean. Looks like you found a blue tantalum capacitor similar to what HAD used. Is that NOS or new stock?

Thanks,

Mike

As you can see, the new resistor (on the right) is very different internally than the NOS one. I'll let the experts decide if they suspect it is metal oxide or not, but it has less turns. One thing is for sure, the new resistors are not built the same as the NOS ones. As far as how they sound, my #1...

Thanks so much for everyone who is interested in this experiment. I was finally able to get to my local electronics store, but unfortunately, they only had one new set of resistors in the values we've been looking at. Here is a pic of the shiny NOS 200K resistors on the left and the new off the shel...

Ian, the one on the first one on the left is obviously darker and almost translucent. The second one from the left has a slightly different shade of color as does the one on the far right. Really, they were a lot closer than I expected. We'll see what the brand new one looks like when I get a hold o...

Before scraping. NTE metal film test 3.JPG After. NTE metal film test 4.JPG The paint/covering of the 430K, 180K, and 2.2K came off fairly easy. The rest of them were pretty tough. The 2.2K seems to have a slightly thinner lead. Having never seen the inside of a metal film before, I learned somethin...

Well, I chose some resistors and did some scraping. here they are in the packs. NTE metal film test 1.JPG NTE metal film test 2.JPG I tried to put them in what I think is their age timeline. The only ones I'm not sure about are the last two. The most resent ones are ROHS compliant like the 180K, but...