Destroyer x Amplifier...Dx amp...my amplifier

[lgreen]

Here is a DX corporation amplifier.
DX likes to recycle, so we started with a Sansui 2000 receiver from the 1970s.



The Sansui looked very nice- separate bass and treble for each channel, but for $5.00 its getting taken home and taken apart to hold the DX.

The back panel was redone for an amplifier and to fit the large heatsinks that luckily will just fit exactly into the case.


All connectors are new except for fuse holders.
Fuse holders have not changed in 30 years.

The DX is working, biased for each emitter resistor to have about 65 mA across it.
Just gets a little bit warm, I will probably increase bias.

Charlie does not care- he wants to go for a walk and chase lizards.


I have replaced gain resistors with higher values to reduce the gain which Carlos says was too high

Power supply is 4x15,000 uF capacitors with no CRC filtering. Xfo is 25-0-25 and 500 VA "rescued" from another project (trash bin).

There is no hum.

DC offset is < 20 mV.

And it turns out everything just fits into the Sansui. I am going to get a fancy new front panel and this will look very nice.

How does it sound- not sure, just got it working and will try with 'real' speakers after I am sure it will not blow up on me.

[dudaindc]

Nice job lgreen!

I just got an integrated JVC on eBay for $4.95 and will follow your example.

Could you please post a picture of the inner side of the back panel? I would like to see how you blocked/sealed the unused openings.

Thanks!

[destroyer X]

New slide movie uploaded to youtube fellows.

Brian have asked pictures.... so, here they are...more than hundred and all them High Definition..... 1700 by 1000 pixels.

enjoy...it is for free!

http://www.youtube.com/watch?v=d52ZrS14WdI

Music is African Beat, by Bert Kaempfert...recorded with tube equipment down the sixties (1960 to be precise)

regards,

Carlos

[lgreen]

Originally posted by dudaindc
Nice job lgreen!
***
Could you please post a picture of the inner side of the back panel? I would like to see how you blocked/sealed the unused openings.

Thanks!

I used to use the cases from floppy disks, just remove the disk on the inside, but they were not solid enough. So years ago I bought a piece of "ABS Plastic Sheet" on Ebay. This is a very thick plastic sheet with a coarse finish ("haircell textured") on one side and smooth glassly/ glossy finish on the other.

Auction for ABS Plastic Sheet

I place the rough side on the inside, and cut to size with anything- dremel, knife, scizzors, drill, tin snips, etc... I drill holes where the old screws were and mount behind using the original screws.

A standard cutting disk with a Dremel will cut this easily on low speed. Note that if you try scizzors that because this plastic is very thick it will leave a white stress mark near the cut so you have to make sure to cut a small amount larger than what will be visible. Dremel cutting leaves no mark. But the point is that this stuff is sturdy, easy to cut shape and drill. And its insulating.
Here is the DX II backside cut with tin snips (note white marks)-


Here is my Pass F5 backside cut with a Dremel-



Here is the DX II on the outside, note the mistake/ white mark from cutting with a tin snip...
too close to the visible part near the lower right corner of 'antenna' where the "FM" part is.


And here is the Pass F5 on the outside


This stuff actually looks very nice and professional, better than you can see in the pics. And its sturdy enough to hold a pair or more of speaker terminals.

If you have spent as much time as I have filing metal for your cases, you will love how easily this stuff can be shaped with a file. Its a pleasure to work with!

[dudaindc]

Awesome!!!
Thanks lgreen!

[lgreen]

No problem, good luck with your "JVC".

One more thing- the shiny side does pick up finger prints and oils from your hands quite easily so please handle with care and wash before using.

Its probably not a big deal anyway since back panels are usually not lit up in lights.

[destroyer X]

Buiding...not cleaned yet.

regards,

Carlos

[destroyer X]

So... let's give it a bath with Wiskie!

Hic!

[destroyer X]

Ship!!!..... board is alike a ship in the ocean..floating in alcohol but wiskie is not working,.

[destroyer X]

But they are huge and works!

Tomorrow.

bye!

Carlos