Bottlehead Forum
Bottlehead Kits => Crack => Topic started by: deltaunit on May 04, 2011, 06:56:05 AM
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I was just looking in the crack manual and noticed the 2.49k resistor is listed as a .25w on the parts list and as a .125w on the circuit diagram.
Which is the correct value, also would a 2k4, 2k5 or even 2k7 resistor be a suitable replacement?
Cheers
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Any of those values will work - 1/2W,1/4W, 1/8W power rating and anything around 2-4K ohms.
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Thanks Doc.
Does anyone have any experience of fancy 'audiophile' resistors (http://www.hificollective.co.uk/components/resistors.html), can they be a worthwhile upgrade?
If so which ones to upgrade, the last pair on the headphone socket? Which type?
Cheers
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Looks like that is the "Bleeder" resistor for eliminating any DC that might leak through the coupling cap. The FP, Eros and Seduction have them too. I wouldn't consider it an audio path resistor, so not anything to upgrade. The volume pot and output cap, 100uF at 160V are in the audio path and is well worth upgrading. I would also consider the third 220uF at 250V power supply capacitor as a good upgrade part.
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Thanks Grainger, I've already ordered an Alps Blue pot and some Ansar Supersound polys for the coupling caps, I think that covers the stock signal path upgrade possibilities. I was just wondering if there was anything else to consider as the next part of my hotrodding experiment :).
Oh, and I have huge overspecced ps caps on order too :D
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There are several threads on Crack upgrade parts in the Crack folder. Looking at the schematic I don't know if there is anything else I would upgrade, but I would roll tubes for a year or two.
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Indeed, I lucked out straight away by finding a Mullard CV4003 in grab bag of 3 valves for about