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KSC2690A and KSA1220A
KSC2690A and KSA1220A
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Old Yesterday, 04:19 PM   #51
rsavas is offline rsavas  Canada
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Great scam, buy up all the stock and then your competition is screwed, , including us DIY. Start selling them at inflated costs on eBay :-) I remember having purchasing, need to go to brokers to get supply.
Same issue with the MJL's.

Wow Mark,

300, life time buy? or eBay sales :-) I usually order min 12, for repairs, new designs. I am running out of A1381, stocking up on c3503 for sure.
Not a fan of TTA(C)004B? They ran fine in my simulation with the Toshiba models, but are not A1381 grade for VAS. I'll order up some TTA(C)004B to use as pre-drivers for testing. Another one that goes in and out of stock. The more we order the better chance of them keeping them alive.

Last edited by rsavas; Yesterday at 04:28 PM.
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Old Yesterday, 04:27 PM   #52
Mark Johnson is offline Mark Johnson  United States
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KSC2690A and KSA1220A
Probably there was a sizeable price reduction beyond qty=250, I don't remember exactly.

I also bought 100 PNP + 100 NPN (and got immediate delivery) of those Toshiba TT00xxxx medium power devices, after Wayne mentioned them as possibilities.

In my mind, if a heaping big bag full of discrete devices costs less than one toroidal transformer, why not? I've got the room to store them.
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Old Yesterday, 04:36 PM   #53
rsavas is offline rsavas  Canada
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One of a kind :-) I hope the bags of semi's have good purpose.
Back to my repairs ... drill out a couple of holes to fit some TO-126, on a old sx-1250 amp board.
Cheers

Last edited by rsavas; Yesterday at 04:39 PM.
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Old Yesterday, 05:23 PM   #54
Mark Johnson is offline Mark Johnson  United States
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KSC2690A and KSA1220A
This device looks like a damn good substitute for KSA1220A and there are thousands of them on the shelf at DigiKey and Mouser.

HOWEVER you will need to learn how to solder surface mount devices with a big wide power tab, to use it. You may have to lay out your own PCBs too,

Choice 1: "I'd rather sit, do nothing, and have no parts, than learn how to solder SMD."

Choice 2: "I'd rather learn how to solder SMD and have parts tomorrow".
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Old Yesterday, 05:35 PM   #55
astx is offline astx  Austria
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KSC2690A and KSA1220A
100Vce...
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Hint: have a look at first post of my threads for an updated index!
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Old Yesterday, 06:13 PM   #56
rsavas is offline rsavas  Canada
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I have not used a sot-89 since the 1990's ... old part, old package, sot-223 maybe ... one day, if TO-126 goes obsolete.
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Old Yesterday, 10:04 PM   #57
woofertester is offline woofertester  United States
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Quote:
Originally Posted by rsavas View Post
Great scam, buy up all the stock and then your competition is screwed, , including us DIY. Start selling them at inflated costs on eBay :-) I remember having purchasing, need to go to brokers to get supply.
Same issue with the MJL's.

Wow Mark,

300, life time buy? or eBay sales :-) I usually order min 12, for repairs, new designs. I am running out of A1381, stocking up on c3503 for sure.
Not a fan of TTA(C)004B? They ran fine in my simulation with the Toshiba models, but are not A1381 grade for VAS. I'll order up some TTA(C)004B to use as pre-drivers for testing. Another one that goes in and out of stock. The more we order the better chance of them keeping them alive.
This attitude I do not understand. Begrudging Mark the right to buy what he wants to buy?

I bought 500 pcs of KSA1381E in 2013 as a lifetime supply. It was probably $100 at the time. Feel free to hate me for buying what I want. Building on Mark's point, a good amplifier chassis is at least $200 and the large ones are more like $400+. it makes sense to me to stock up on the parts I like. I recently bought 200 pcs each of Toshiba 2SA970BL and 2SC2240BL in the original Japan sealed static bags. Spent last weekend binge curve tracing to find matched pairs at the voltage and bias current that I want to use. Curve tracing a couple hundred parts gives me a much better idea of how the devices behave than measuring just a few parts.
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Old Yesterday, 10:07 PM   #58
rsavas is offline rsavas  Canada
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Quote:
This attitude I do not understand.
it is called a joke, lighten up chap.
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Old Yesterday, 11:40 PM   #59
woofertester is offline woofertester  United States
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Originally Posted by rsavas View Post
it is called a joke, lighten up chap.
Sorry that the humor was lost on me. Different jokes for different blokes. Carry on.

...A string goes into a bar. He orders a beer but the bar tender says "We don't serve your kind in this bar." ......
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Old Today, 12:19 AM   #60
Mark Johnson is offline Mark Johnson  United States
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KSC2690A and KSA1220A
Man goes into a restaurant. Waiter hands man a menu.

Man says to the waiter, "What is the Soup du Jour?"

Waiter replies, "I don't know, I'll have to go ask the chef," and departs

Waiter returns a few moments later and says, "That's the soup of the day."
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