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Revisiting some "old" ideas from 1970's - IPS, OPS
Revisiting some "old" ideas from 1970's - IPS, OPS
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Old 3rd January 2018, 07:03 PM   #2381
Idefixes is offline Idefixes  France
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Quote:
Originally Posted by thimios View Post
Glad to see this thread alive again!
Nice wok Indefixes !
Thanks
Marc
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Old 3rd January 2018, 08:36 PM   #2382
filenet is offline filenet
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I have terrible shaking hands. My method for soldering SMDs:
1.I put gel flux on the pads, and add a little solder on the soldering iron tip(i assume that you have a temperature controlled one, don`t you?)
2.I take the component with the tweezer and position it in place...i often use both hands
3.Once the component is exactly in the right place i grab the soldering iron and solder the most accesibile pad of the component
4.I like at this stage to push down the component with my hand and resolder the joint that i made. I do this to make shure that the component rest perfectly flat on the board.
5.I solder the rest of the joints and resolder last, the joint that i made first.
Gel flux is magical when you have to solder multipin components.

happy new year to all!
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Old 4th January 2018, 03:00 PM   #2383
evanc is offline evanc  United States
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Revisiting some "old" ideas from 1970's - IPS, OPS
Idefixes Nice work. These are nice amps. I don't know the reason but they are easy to build into a very quiet unit...No hum or buzz. I also like the plywood chassis. I use them myself and have been instructed to ground the heatsink.

Thimios Thanks. It's nice to be back.

E
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Old 4th January 2018, 04:43 PM   #2384
Idefixes is offline Idefixes  France
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Quote:
Originally Posted by evanc View Post
Idefixes Nice work. These are nice amps. I don't know the reason but they are easy to build into a very quiet unit...No hum or buzz. I also like the plywood chassis. I use them myself and have been instructed to ground the heatsink.

Thimios Thanks. It's nice to be back.

E
Hi Evan,
Plywood is easy to work....and i am more confortable with wood work than metal work. Tha,ks for advice about heatsink grounding. All metal pieces on case will be grounded (safty practice...). In amp case trafos will be located in down part of case V/S amp board and smoothing bank in the uper part of case separated from down part by a metal sheet also groundred. I join you latest progress on 6j6 preamp face veenering.
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Old 4th January 2018, 04:55 PM   #2385
Kay Pirinha is offline Kay Pirinha  Germany
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Would you mind to share your 6J6 preamp's circuit?

Best regards!
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Old 4th January 2018, 05:08 PM   #2386
Idefixes is offline Idefixes  France
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Quote:
Originally Posted by Idefixes View Post
Hi Evan,
Plywood is easy to work....and i am more confortable with wood work than metal work. Tha,ks for advice about heatsink grounding. All metal pieces on case will be grounded (safty practice...). In amp case trafos will be located in down part of case V/S amp board and smoothing bank in the uper part of case separated from down part by a metal sheet also groundred. I join you latest progress on 6j6 preamp face veenering.
No soucy. I will just make two little mod on board. If you want PM me for e-mail.

Best Reagrds Marc
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Old 4th January 2018, 06:33 PM   #2387
jwilhelm is offline jwilhelm  Canada
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I have a new input power supply for the NS series amps ready for testing. It's powered from two 10AV transformers so the input stage supplies are completely separate from the output supplies, so they won't see the droop or ripple. The +/-15V rails are regulated with low noise TPS7A4901/3001 regulator ICs and the high voltage rails are a discrete adjustable design Valery put together that can supply anything from 40v - 75V by adjusting a trim pot.
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Old 4th January 2018, 06:45 PM   #2388
thimios is offline thimios  Greece
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Originally Posted by jwilhelm View Post
I have a new input power supply for the NS series amps ready for testing. It's powered from two 10AV transformers so the input stage supplies are completely separate from the output supplies, so they won't see the droop or ripple. The +/-15V rails are regulated with low noise TPS7A4901/3001 regulator ICs and the high voltage rails are a discrete adjustable design Valery put together that can supply anything from 40v - 75V by adjusting a trim pot.
Nice!
I guess all IPS will be happy with this quiet power supply!
Will be interesting to see if this affect measurements or if it is audible.
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Old 4th January 2018, 06:49 PM   #2389
jwilhelm is offline jwilhelm  Canada
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I'm interested to see if it makes any difference. They're pretty quiet already. A couple of the input stages won't drive the VAS output to rail voltage (TubSuMo is one) so it will increase the amplifier's output.
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Old 4th January 2018, 06:53 PM   #2390
jwilhelm is offline jwilhelm  Canada
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Thimios, do you have any 12AU7 tubes or tube sockets?
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