SJS resuscitated

[sjs]

Inspired in part by some L'Amp and Le Monstre builds, it appears I am about to break a 25 year embargo on sand based amplifiers



when I say "about", one must interpret that in a very loose way

Designed by Nelson Pass using original Sony VFETs which he has personally tested and matched. It should be good for about 15W per channel, and as I want to use a bit R-core mains tx and LCLC PSU design it will be monoblocks.

Should be interesting.....

[Mike Adams]

Is this likely to be in a similar vein to Guy's Le Monstre build?

Id be keen to hear it once finished Simon, it would be an interesting comparison with the Border Patrol...

[sjs]

Similar but different to Guy's Monstre. Similar in that it is approx 15w class A SS amp; different in that it uses different types of output devices and I am thinking of a choke input psu, like in the BPs. Another build of this amp has already been described as being a bit like a PP300B amp, so comparison to yours should be quite entertaining.
But don't hold your breath, it could be quite some time.......

[sjs]

Just finished this little project making up a nice little SUT using Hashimoto HM-7 transformers.

Dual primaries can be switched for high/low impedance carts, and the grnd connection on the primary can be isolated for floating the MC coils. The casework is lined with mu metal sheet for screening, and solid core silver hook up wire and WBT silver loaded solder helps to up the foo factor











Sounds really nice with my Ortofon cart, probably prefer it to the T-3000 as it has more body and a bit more drama to the presentation.

[julesd68]

That SUT just oozes quality, looks really nicely finished ...

[Barry]

Neat work - well done!

[anubisgrau]

Sounds really nice with my Ortofon cart, probably prefer it to the T-3000 as it has more body and a bit more drama to the presentation.

aaaah, no waaaay:=)

[sjs]

aaaah, no waaaay:=)

Yes way

Certainly seemed that way this afternoon. T-3000 had more precision and finesse, but hm-7 had more tone, structure and drama to the presentation.
Both very nice, but different

[anubisgrau]

we had recently HM-X vs T-5000 vs T-3000 shoot out, guess which stayed at the bottom

[sjs]

I have had a couple of sets of HM-7 but not the HM-X. They seem to have similar specs, but the 7 has better LF extension and the X better HF. This suggests the X has fewer turns on the windings and less primary inductance, which may be a problem with some carts but not those with v low internal impedance.
It would be good to here an X and 7 together at some point.