I have been visiting the dumpster for electronic garbage lately, picking up old HI-FI components for parts. I'we aquired a lot of transformers, tropical fish capasitors, those cute silver caps from the 70's and old ge diodes and transistors.

Yesterday I found an old Tandberg radio reciver in great condition. It should be easy to modify the front to have only one volume controll, and I'm planning to change the backlite frequenzie-indicator to a logo. The top and sides are beautifully figured teak, and the front is brushed aluminium and glass. I think it's going to look supercool!!!

The radio is made in 1974,and have an extreme number of high quality capasitors. I still havent checked the voltages from the transformer, but it looks solid and huge, with 120. 220 and 240 V primary. The secondaries have 8 pins, so I guess there will be a wide array of voltages to select from.

So, here is what it looks like:

Just wanted to post the first pictures of my in progress of my lm1875-amp. The boards are asembeled, and the heatsinks are cut to the right sizes. Now I just got to find a suiteable transformer and build myself a chassis, wich will be the most time-consuming part....

Big pics ahead

Amplifier board and heatsink 1
Amplifier board and heatsink 2

If anyone is interessted, here is a Hiwatt custom 50 simulator using Jfets. I haven't tried this yet, but I guess this will make a good preamp. Just run it at 18V, and use some 500k or 1M Trimpots.

I have named it Hiawatha Click the images for bigger versions.

Schem:


vero-layout:

Hi.
I have a broken Pioneer amp, and I'we ordered my first amp kit from Joe. I was hoping to use some of the parts of the Pioneer in my kit, mainly the transformer. My question is; how do I measure the secondary voltages on a transformer? And how much power does a stereo LM1875-amp need?

Nice place, by the way.  :tu: