Dx Blame MKIII-Hx - Builder's thread - Page 163

evette · 31st December 2012, 01:45 AM

Mr. Wanye I,m sorry but my budjecty doesn,t allow me to drink eggnog. I get BOMDED on one drink only LOL

evette · 31st December 2012, 01:48 AM

Sorry Fella,s I always like to mix cricuit up,,I could really use a glass of johnnie walker GREEN. LOl

destroyer X · 31st December 2012, 09:30 AM

You have an entire 1000 square meters appartment inside my heart... do not need to pay for use it... you just cannot leave it.

Happy new year Evette...you are never off topic to me.

regards,

Carlos

canonnica · 31st December 2012, 01:36 PM

I just ordered some 2SA968B & 2SC2238B from Littlediode (UK). I don't know what to expect as if they're genuine, but I'll give them a try.

These will take the spots held by MJE15030&31 at the CCS, VAS & driver positions.

Mart.

destroyer X · 02:46 PM

But i found them fragille...i had some of them burned...well.... read my name, Destroyer x means extra Destroyer....this is what i use to make, to burn parts.

2SC4793 and counterpart are better... see the capacitance and compare.... this one 20pf and 2SC2238 is 25pf.... watch the maximum frequency..the same...watch power...the same... 4793 does not need insulators..also the number is higher, means it is more modern.

I understand that more modern does not mean better.... about BD139/140, the higher numbers, the most modern ones are worse...it can happens with these units we are discussing too..but i have listened both...and for sure 2SC4793 sounds better...matches better to the amplifier voltage..i have tried one into high voltage unit...was an old model.... Troyan i think.

Already ordered?.. then good luck to you...i suggest you to order the 2SC4793 and complementary too.

regards,

Carlos

canonnica · 03:44 PM

Carlos, I've imported SPICE models for them as well and they don't give any better result than the MJE1503x. The fT for the pair you suggest are not well matched, 100MHz vs 70MHz, so I'm not sure they will be good drivers.

The best pairs I've found so far are Toshibas 2SA968B & 2SC2238B and Sanyos 2SA1011 & 2SC2344.

I should get my old Toshibas within a few weeks, I'll post observations when I install them

a.wayne · 31st December 2012, 04:25 PM

What are you trying to improve with the change , sonics, stability , drive, bandwidth ?

What if we use the outputs instead ...?

destroyer X · 31st December 2012, 05:58 PM

What will happens there is not something to worry about, unless this appear into the capacitance in between transistor leads.

This mismatch will appear into harmonics that will produce interference into VHF radio band.... will not bother humans.

regards,

Carlos

evette · 31st December 2012, 09:06 PM

Mr. Carlos Who said we are all human,,just ask my wife. LOL Evette

destroyer X · 1st January 2013, 03:39 PM

Because no one believe.

Ahahahahahah!

regards,

Carlos

31st December 2012, 09:30 AM	#1623
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	With the bottle or without it you are very welcome You have an entire 1000 square meters appartment inside my heart... do not need to pay for use it... you just cannot leave it. Happy new year Evette...you are never off topic to me. regards, Carlos __________________ Sons visiting uncle charlie; http://www.youtube.com/watch?feature...&v=5T76qsvZrdw; http://www.youtube.com/watch?v=Hb_wolQGU5Y

31st December 2012, 02:36 PM	#1625
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	I have used these ones you said...they sound good But i found them fragille...i had some of them burned...well.... read my name, Destroyer x means extra Destroyer....this is what i use to make, to burn parts. 2SC4793 and counterpart are better... see the capacitance and compare.... this one 20pf and 2SC2238 is 25pf.... watch the maximum frequency..the same...watch power...the same... 4793 does not need insulators..also the number is higher, means it is more modern. I understand that more modern does not mean better.... about BD139/140, the higher numbers, the most modern ones are worse...it can happens with these units we are discussing too..but i have listened both...and for sure 2SC4793 sounds better...matches better to the amplifier voltage..i have tried one into high voltage unit...was an old model.... Troyan i think. Already ordered?.. then good luck to you...i suggest you to order the 2SC4793 and complementary too. regards, Carlos __________________ Sons visiting uncle charlie; http://www.youtube.com/watch?feature...&v=5T76qsvZrdw; http://www.youtube.com/watch?v=Hb_wolQGU5Y Last edited by destroyer X; 31st December 2012 at 02:46 PM.

31st December 2012, 03:24 PM	#1626
canonnica diyAudio Member Join Date: May 2011 Location: Quebec	Carlos, I've imported SPICE models for them as well and they don't give any better result than the MJE1503x. The fT for the pair you suggest are not well matched, 100MHz vs 70MHz, so I'm not sure they will be good drivers. The best pairs I've found so far are Toshibas 2SA968B & 2SC2238B and Sanyos 2SA1011 & 2SC2344. I should get my old Toshibas within a few weeks, I'll post observations when I install them Last edited by canonnica; 31st December 2012 at 03:44 PM.

31st December 2012, 05:58 PM	#1628
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	Cannonica... we cannot listen 70 Megahertz What will happens there is not something to worry about, unless this appear into the capacitance in between transistor leads. This mismatch will appear into harmonics that will produce interference into VHF radio band.... will not bother humans. regards, Carlos __________________ Sons visiting uncle charlie; http://www.youtube.com/watch?feature...&v=5T76qsvZrdw; http://www.youtube.com/watch?v=Hb_wolQGU5Y

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31st December 2012, 01:45 AM	#1621
evette diyAudio Member Join Date: Jun 2006	Mr. Wanye I,m sorry but my budjecty doesn,t allow me to drink eggnog. I get BOMDED on one drink only LOL

31st December 2012, 01:48 AM	#1622
evette diyAudio Member Join Date: Jun 2006	Sorry Fella,s I always like to mix cricuit up,,I could really use a glass of johnnie walker GREEN. LOl

31st December 2012, 01:36 PM	#1624
canonnica diyAudio Member Join Date: May 2011 Location: Quebec	I just ordered some 2SA968B & 2SC2238B from Littlediode (UK). I don't know what to expect as if they're genuine, but I'll give them a try. These will take the spots held by MJE15030&31 at the CCS, VAS & driver positions. Mart.

31st December 2012, 04:25 PM	#1627
a.wayne diyAudio Member Join Date: May 2008 Location: Front Row Center	What are you trying to improve with the change , sonics, stability , drive, bandwidth ? What if we use the outputs instead ...?

31st December 2012, 09:06 PM	#1629
evette diyAudio Member Join Date: Jun 2006	Mr. Carlos Who said we are all human,,just ask my wife. LOL Evette

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