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i'm on a roll... the kgsshv


kevin gilmore

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  • 2 weeks later...
Justin, any news on the 2SA1486's you were selling?

By the way, thank you for the SR-009 :)

 

i posted in the T2 thread.  i can get a good price on 'real' ones and i can get a better price on 'possibly real' ones.  i'm checking them out first.  most likely they will be fakes and i'll move on.

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I always get dual windings as well. I can't see any downside to it.

Are you still using the latching switches from that computer case place Birgir? If not, what?

Well I bought a pile from them so I still have some but I also bought 50 more from Alibaba. I might have a problem with stockpiling stuff.... :D I also just ordered some PCB's for these switches to make them easier to use. Built in spot for a resistor to drop DC voltage higher than 12V etc.

Now I'll get back to designing the PSU for the single ended Stax amp... :)

Edited by spritzer
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The only downside to dual primaries is cost.

Birgir, how are you implementing the latching switches? I thought that most of these weren't capable of switching the voltage and/or current levels that we need them to. Or am I just over thinking this?

[edit]I just looked at the specs of one of the 22mm Bulgin latching switches, clearly I'm wrong since they're rated for 250VAC/5A which should be sufficient on the primary side of most headphone amps.

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Most of these switches can indeed handle 5A/250VAC but sometimes you have to track down the manufacturer and the actual spec sheets.

 

Spritzer, will you any boards for sale for the latching switches?


Sure, I bought 100 of them... :laugh:   They were on the expensive side due to the routing required but it wasn't too bad.  I also have pcb's for the Alpha pot, pots too and the teflon Stax sockets should anybody need them. 

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Is the NTE2588 an acceptable substitute for the Toshiba 2SC4686A, which is near impossible to track down now....

 

I compared data sheets and they are very close, but there are some subtle differences, but it seems like the major specs match and physically they should fit... I think.

Example, the continuous collector current on the NTE is 30mA, the Toshiba is 50.

 

NTE2588 Data Sheet http://www.nteinc.com/specs/2500to2599/pdf/nte2588.pdf

2SC4686A Data Sheet http://www.mouser.com/ds/2/408/7834-30958.pdf

 

Of course if there is another alternative, this is the first I've found and investigated.

 

I'll be doing the same for the 2SA970 and 2SC1815 next...

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The best alternative would be the 2SC4686 which is the same part with a lower voltage rating.  Still in production last I heard. 

 

I'd like to buy 3 of each (PCB's) if you don't mind.

 

No problem.  The switch PCB's should be here in a week or two so drop me a line then.  :)

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