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Pumpkin preamp - ordered by Steen , official making thread
Pumpkin preamp - ordered by Steen , official making thread
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Old 15th March 2011, 08:04 AM   #2931
Abraxas336 is offline Abraxas336  Europe
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I have to admit "shooting it" was among my first thoughts, however that is satisfactory only at a very very short term .

Ex post praying did not work, so I guess will have to actually put other resistors. The fuse socket is not such a bad idea since these PCBs clearly have been designed to solder ONCE and then never again .

I don't really know how much current runs through these resistors during startup and why 1W is not enough - I already halved the value. Without much experimenting - bear in mind frequent soldering/desoldering is not the best thing to do to these PCBs - what should I use? 1/2W Carbon 2R? Generg mentioned MOX?

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Old 15th March 2011, 08:30 AM   #2932
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Pumpkin preamp - ordered by Steen , official making thread
use 1R/1W

MOX are smallest in size
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Old 15th March 2011, 08:51 AM   #2933
Abraxas336 is offline Abraxas336  Europe
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OK. Should I change R23(a)/R24(a), too? Today it's the same 2R 1W and they did not blow, however I would like to find a setup that reliably survives at least 1000 On/Off cycles without me opening the case and exchanging resistors...
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Old 15th March 2011, 08:53 AM   #2934
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Pumpkin preamp - ordered by Steen , official making thread
change them too ;

you obviously found superduperhungry caps
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Old 15th March 2011, 09:11 AM   #2935
Abraxas336 is offline Abraxas336  Europe
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I suppose that is a actually good thing... .

Will change to 1R1W and report back. If it blows again I WILL shoot it!

Thanks for support.

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Old 15th March 2011, 02:03 PM   #2936
jacco vermeulen is offline jacco vermeulen  Netherlands
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Worst case, you could always go overkill.
Like : 1R8 Fukushima MPC, MP925 (non-radiated ones if you're fast ).
Or fat pocket Isabellenhüte PBH, Bourns PWR221, etc.

(still think pointing a Hammer 44 Magnum at it is quick and painless)
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Old 15th March 2011, 02:32 PM   #2937
Abraxas336 is offline Abraxas336  Europe
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Thats for pussies. If they blow again I will use this.
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Old 15th March 2011, 03:11 PM   #2938
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naah ....

call her for help
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Old 19th March 2011, 10:01 PM   #2939
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Hi Zen Mod,
PM sent.

Anto
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Old 27th March 2011, 11:41 AM   #2940
breizheau is offline breizheau  France
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Hi there.

I have started to check and solder what i have in stock...

On Pumpkin cook book, i read : R9, R10, R14, R15, R29 : 150E to 240E.
How can i define the good value ? Is 220R OK ?

How to define the correct value for caps ?

Sorry for these noob questions... But i am sure i'll have more...
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