I went dumpster diving last week and found a pair of huge LED lighting heatsinks that I managed to fabricate into a decent amplifier assembly.
Now, what am I going to do with them ?
I've got an Aleph 4 which is brilliant. I have heard that the Aleph X and Aleph J are worth listening to.
This case should be quite good for a good Class A amplifier.
Now, what am I going to do with them ?
I've got an Aleph 4 which is brilliant. I have heard that the Aleph X and Aleph J are worth listening to.
This case should be quite good for a good Class A amplifier.
Attachments
25W Class A Amplifier
I did fill it with "The Best Amplifier that I have ever heard" but it was disappointing. It was OK but nowhere near as good as the Aleph 4.
That particular design really does get roasting hot.
I did fill it with "The Best Amplifier that I have ever heard" but it was disappointing. It was OK but nowhere near as good as the Aleph 4.
That particular design really does get roasting hot.
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The Aleph J would certainly be worth listening to. Either with NOS Toshiba JFets or the newer Linear Systems ones from the store. Since the store is out of matched IRFP240s, you could try single IRFP150s, or my prefered FQH4410s in their place. Crank the bias to 1.8A to 2 Amps, or until your 300VA transformer starts to sag. You have plenty of cooling capacity with the fan. Better if you could go dual-mono. 😉
An alternative might be the F6. It has a different sonic signature than the Aleph J. Just need to keep the Jensen signal transformers at the opposite end from the power transformer.
An alternative might be the F6. It has a different sonic signature than the Aleph J. Just need to keep the Jensen signal transformers at the opposite end from the power transformer.
What about one of ZenMod's SIT amps, while unobtanium parts are still avaliable?
THF-51S THF-51N TOKIN SIT 2SK182ES 2SK180 avaliable if you look at other posts.
THF-51S THF-51N TOKIN SIT 2SK182ES 2SK180 avaliable if you look at other posts.
The SissySIT caught my eye as well, but suitable (correct Vgs threshold) parts were unavailable until just recently. This amp seems to require the THF-51 S or N variety.
Reminds me of school in the 1960's where one of my mates was into radio.
We used to get permssion to leave school at lunchtimes and go dumpster diving outside local radio and TV shops. He used to hide the stuff he got and picked it up after school on the way home.
I managed to buy 20 x 2SJ74 from a seller in the USA and 25 x IRFP240 from Farnell.
Hopefully I will be able to get enough matches from that lot.
Hopefully I will be able to get enough matches from that lot.
I do recall when my Dad built the Aleph 4, we were looking for sextets of Mos-Fets. I've got 100s of them here so I guess that was a challenge.
I managed to get the entire cap selection from Mouser with the exception of the 1uF Polyprops, they seem to be difficult to get hold of.
I found some foreign ones for the time being.
I found some foreign ones for the time being.