Author Topic: DIY Power Amplifier: PALADIN SM-150  (Read 37379 times)

Offline gavinbirss

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Re: DIY Power Amplifier: PALADIN SM-150
« Reply #630 on: July 26, 2017, 11:24:23 AM »
scratching my head now... connected the IPS/VAS & current gain stages. Measure 45V on the output (13V with IPS/VAS disconnected (current gain only))..

Current gain - All Transistors are isolated from the heat-sink, voltage to the board is correct & LEDS are green, all components are in the right place with correct polarity, fuses are happy, nothing is hot, no strange noises or smoke were released at any stage.

IPS/VAS, same as above, I have just not triple checked all components but I did when building. Measure 2v on the test points without adjusting so that seems in the right range. (when connected to current gain)

I've been looking at it too long probably something very silly done somewhere.

Perhaps test with bypassing output relay/speaker protection.
Any sudden change in power supply rails during power up?

Offline SeanS

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Re: DIY Power Amplifier: PALADIN SM-150
« Reply #631 on: July 26, 2017, 12:33:53 PM »
Perhaps test with bypassing output relay/speaker protection.
Any sudden change in power supply rails during power up?

Yes I have bypassed these to be sure, at power on it goes to 45V, if I leave it on a minute it slowly reduces to approx 37v

  Have you tried turning it off and on again?

Yes I did, same result

Offline gavinbirss

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Re: DIY Power Amplifier: PALADIN SM-150
« Reply #632 on: July 26, 2017, 01:28:21 PM »
@SeanS

Can you take patient to creator? Ian?

Offline SeanS

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Re: DIY Power Amplifier: PALADIN SM-150
« Reply #633 on: July 26, 2017, 01:51:39 PM »
@SeanS

Can you take patient to creator? Ian?

I'm in CT, will have a break and look with a fresh eye!

Offline gavinbirss

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Re: DIY Power Amplifier: PALADIN SM-150
« Reply #634 on: July 26, 2017, 02:40:10 PM »
I'm in CT, will have a break and look with a fresh eye!

Hope you get it sorted.
 :coffee:

Offline SeanS

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Re: DIY Power Amplifier: PALADIN SM-150
« Reply #635 on: July 28, 2017, 05:33:28 PM »
Found it, :clap: seems connecting the feedback wire is quite important  :clap:.. 0.1V on the outputs, or about. Biased ok.. next is to leave it on for a while and check all is OK and then sound hopefully.... I'm sure I'll have another hurdle like hummmm... or something else to contend with, none of my wires are shielded.







Offline gavinbirss

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Re: DIY Power Amplifier: PALADIN SM-150
« Reply #636 on: July 28, 2017, 06:06:06 PM »
 :clap:

Offline The Godfather

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Re: DIY Power Amplifier: PALADIN SM-150
« Reply #637 on: July 28, 2017, 10:28:56 PM »
0.1V on the outputs, or about.
Good feeling ey :)

is that 0.1volts or 0.01Volts? 100mV offset is on the highish side and I seem to remember reading this design was servo controlled?

None the less shouldn't do any harm to speakers.

Offline JANNAS

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Re: DIY Power Amplifier: PALADIN SM-150
« Reply #638 on: July 29, 2017, 11:26:04 PM »
100mV DC is much to high for such a high end amp.If there is a servo it must not be more than 5mV DC. Check the AC volts as well on the speaker outputs. Should be 0 volts if all is 100%. Has the input transistors been matched ?

Offline blizzard

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Re: DIY Power Amplifier: PALADIN SM-150
« Reply #639 on: August 12, 2017, 06:51:55 PM »
Any news on this front?

Sound impressions SeanS ????

Offline SeanS

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Re: DIY Power Amplifier: PALADIN SM-150
« Reply #640 on: August 13, 2017, 07:40:02 AM »
Any news on this front?

Sound impressions SeanS ????

I blew a few components on the z-reg board  :headbanger:, I have ordered them and expect them to arrive early next week, then I should be up and running  :pray:

Offline blizzard

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Re: DIY Power Amplifier: PALADIN SM-150
« Reply #641 on: August 14, 2017, 12:34:13 AM »
Sorry to hear that.
Anything we should know not to make the same mistake ?
Looking forward to your feedback  :rubhands:

Offline Rhino

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Re: DIY Power Amplifier: PALADIN SM-150
« Reply #642 on: August 14, 2017, 08:54:27 AM »
Found it, :clap: seems connecting the feedback wire is quite important  :clap:.. 0.1V on the outputs, or about. Biased ok.. next is to leave it on for a while and check all is OK and then sound hopefully.... I'm sure I'll have another hurdle like hummmm... or something else to contend with, none of my wires are shielded.





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Offline SeanS

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Re: DIY Power Amplifier: PALADIN SM-150
« Reply #643 on: August 14, 2017, 10:13:52 AM »
uuurgh.... my parts arrived from RS, somehow I have a packet which says 2N6517TA, the website shows as 3 Pin TO92, but mine have 4 pins and what appear to be 2 lights on them..  :headbanger: something went horribly wrong in the factory

Offline SeanS

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Re: DIY Power Amplifier: PALADIN SM-150
« Reply #644 on: August 14, 2017, 03:38:40 PM »
ok... got the 1 z-reg going with MPSA42/92 instead of the others..  :thumbs:, now for the other one  :pray: