Looked like regular FR4 to me.
btw, phenolic resin is the preferred flame resistant/retardent material for interior panelling in the yacht/ship/offshore industry.
Recent example of what to expect from burning GRP :
FIVE MILLION POUND SUPER BOAT GOING UP IN FLAMES THE KAHU - YouTube
East Cowes Boat Fire Still Burning Seven Hours On - YouTube
btw, phenolic resin is the preferred flame resistant/retardent material for interior panelling in the yacht/ship/offshore industry.
Recent example of what to expect from burning GRP :
FIVE MILLION POUND SUPER BOAT GOING UP IN FLAMES THE KAHU - YouTube
East Cowes Boat Fire Still Burning Seven Hours On - YouTube
That's a very good price. Do you mind sharing the source? I'd like to buy some.
I remember in the past when I just place 2pair 2922/1216 original and 2pair fakes, all 4pair with 0.5ohm Re. The sound is better than all original version. The amp is now blow up at driver stages during thermal cycle. Many of my friend also ask me to restore it or built another but I just not
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Funny fakes sanken, the seller says it is the best transistor he has, only two pair left, Rp 40000/pair while original only around Rp30000/pair.
.Funny fakes sanken, the seller says it is the best transistor he has, only two pair left, Rp 40000/pair while original only around Rp30000/pair
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Hello mr. Marsh,
It's an old thread...I know
I need to go off topic, because I finally found you.
My friend who made one MC amplifier ( a.m. Ortofon MC20) designed by you back in the eighties, would like to have the drawn circuit. The circuit has two 2905 transistors ( I think it was) without directly powersupply... as he explained to me.
I think you published the circuit in a american magazine back then.
Hobe to hear from you.
Best regards
Gudmund
Hi Jacco,
One more question from a friend who does not post here.......
We have four pairs of original Sanken LAPT 2SC3284 / 2SA1303 14A / 150V in a TO-3P house .....the TO-3P houses Sanken LAPT (Large Area Parallel Transistor) which is ring emitter transistors.
Recently we received four pairs of Sanken LAPT 2SC2922 / 2SA1216 17A/ 180V MT200 house. The LAPT 2SC2922 / 2SA1216 from Sanken we received from Ebay were all fakes.
We have two questions......does the "smaller" TO-3P 2SC3284 / 2SA1303 perform like the larger MT200 2SC2922 / 2SA1216 if one keep the plus/minus rail supply within +- 45Vdc...or do you have better experience with the MT200 types?
If your answer is yes to the MT200 types........where in Europe can we buy the MT200 as genuine Sanken and not fakes from the far east?
Gudmund
Hi,
in the first half of the 90s I got the impression that nearly every amp that claimed to be HighEnd or SotA worked with the Sanken LAPTs.
The fastet LAPTs I know of are the Sanken 2SA1186/2SC2837 100W/150V types in TO-3P/MT100 casings.
This type is for example actually used in the L12-2 amp-modules in a CFP Dual configuration.
Besides Sanken, Inchange-Semi from China manufactures those LAPTs (iscsemi.cn).
The specs and diagrams of the DS seem identical to the Sanken.
ISC also makes the beefier and larger (MT-200 casing) 2SA1215/2SC2921, the 2SA1916/2SC2922 and the 2SA1295/2SC3264.
At least the numeric specs seem identical to the Sanken.
Supplier Reichelt.de lists the ISC 1186/2837 for 0.99/1.35€, the 1215/2921 for 1.80€ each, the 1216/2922 for 1.75/2.15€ and the 1295/3264 for 2.15€ each.
The 1186/2837 work flawlessly for some years now in the L12-2amps (btw. one of the very few solidstate amps that drives my ESLs unconditionally stable and well-sounding).
So seemingly no reason to distrust ISC here for supplying crappy fakes.
Cost is also no reason to not try them.
jauu
Calvin
in the first half of the 90s I got the impression that nearly every amp that claimed to be HighEnd or SotA worked with the Sanken LAPTs.
The fastet LAPTs I know of are the Sanken 2SA1186/2SC2837 100W/150V types in TO-3P/MT100 casings.
This type is for example actually used in the L12-2 amp-modules in a CFP Dual configuration.
Besides Sanken, Inchange-Semi from China manufactures those LAPTs (iscsemi.cn).
The specs and diagrams of the DS seem identical to the Sanken.
ISC also makes the beefier and larger (MT-200 casing) 2SA1215/2SC2921, the 2SA1916/2SC2922 and the 2SA1295/2SC3264.
At least the numeric specs seem identical to the Sanken.
Supplier Reichelt.de lists the ISC 1186/2837 for 0.99/1.35€, the 1215/2921 for 1.80€ each, the 1216/2922 for 1.75/2.15€ and the 1295/3264 for 2.15€ each.
The 1186/2837 work flawlessly for some years now in the L12-2amps (btw. one of the very few solidstate amps that drives my ESLs unconditionally stable and well-sounding).
So seemingly no reason to distrust ISC here for supplying crappy fakes.
Cost is also no reason to not try them.
jauu
Calvin
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I has bought from here.Profusion plc, Audio Semiconductors and Components - Splash Screen
I hope that these are original.
~10 years ago, Walter Fuchs preferred the ISC versions over Sanken devices for his SAC power amps. (A1294/C3263 in the Igel)
Depends what you intend to do with them, imo.
If dissipation is a factor, the much larger MT200 package has a significant advantage over MT100/TO3-P, or any other power device.
e.g. my personal favorite pair is the A1215/C2921, I'd pick 5 pairs of those over 4 pairs of A1216/C2922.
(but that's just me, only kW numbers I find interesting are diesel/generator specs)
Thanks for the link! Is Profusion a UK company? They got 2SC2922 / 2SA1216 in stock ...and I thought this pair was obsolete and out of production line?
Gudmund
Thank you very much! I apologize for the direct way to write you. The reason is that I have read a great deal of your posts, and that I think I know you.
I shall look for A1215/C2921 ....they take a little less voltage 150V / 15A ..I do like the term "diesel/generator specs"......secondly I think that dissipation is a factor if we want to have a long lasting amplifier.
Gudmund
Thank you....we haven't looked for Sanken opt's the last couple of years, and now wondering why there are so many fakes on the market, when you can get genuine transistors?
Gudmund
I bought these a month ago.
It seems that Sanken puts these in production again
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The shipment from Profusion looks professionel just like packages from RS or Farnell. Nice to know.
Thanks for the explanation of Sanken BJT's. They do seem to be the ultimate transistors. They (2SC3264 & SSA1295 ) are used in this clone of a Burmester 933. Would an amp like this sound great?
Audio Amplifiers Counterfeit Berlin 933 amp amplifier circuit made into the original machine voice loud and delicate power 500w-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group
Audio Amplifiers Counterfeit Berlin 933 amp amplifier circuit made into the original machine voice loud and delicate power 500w-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group
I don't think that's a huge driver to be honest.
I think the bigger issue is that it has only up until recently been challenging for DIY'ers outside of Japan to access a reliable source of supply of Sanken power transistors at a good value total price versus the competition.
For DIY SPICE players, if you look at the current trends then the ubiquitous power transistor models that are being used here are not actually manufacturer generated, but through third parties.
Then finally, is it really that important? For example most of the Slewmaster sims demonstrate excellent performance with fairly ubiquitous 30MHz devices. That part really depends on the amp architecture. It doesn't really seem many topologies which have a high reliance on output stage characteristics is in vogue here at Solid State at the moment.
I think the bigger issue is that it has only up until recently been challenging for DIY'ers outside of Japan to access a reliable source of supply of Sanken power transistors at a good value total price versus the competition.
For DIY SPICE players, if you look at the current trends then the ubiquitous power transistor models that are being used here are not actually manufacturer generated, but through third parties.
Then finally, is it really that important? For example most of the Slewmaster sims demonstrate excellent performance with fairly ubiquitous 30MHz devices. That part really depends on the amp architecture. It doesn't really seem many topologies which have a high reliance on output stage characteristics is in vogue here at Solid State at the moment.
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