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CSP3 ... fuses in the center of the circuit ... (Read 5311 times)

safebelayer

Seasoned Member

Posts: 202

CSP3 ... fuses in the center of the circuit ...
03/31/20 at 02:44:20

I purchased this CSP3. I'm concerned with the legitimate nature of the unit as it was purchased for a screaming deal off of OfferUp. It all looks right, but in looking at the circuit compared to the one on the website it looks very different. Note the fuses in the center of the circuit. I recognize that the Jupiter caps are a standard upgrade.

Thanks for the help

csp3_circuit.jpg

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Lon Seasoned Member "Love without guts is worthless!" Philip K. Dick Posts: 25750	Re: CSP3 ... fuses in the center of the circuit ... Reply #1 - 03/31/20 at 03:15:55 That fuse panel is now standard. My CSP3-25 has it and my Taboo Mk IV and Monoblocks also have them when built.
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piezoman Ex Member	Re: CSP3 ... fuses in the center of the circuit ... Reply #2 - 09/28/20 at 16:53:25 When we upgrade our fuses, do we upgrade these in addition to the one at the IEC power cord connection? Or is a fuse upgrade for a component considered complete when we only upgrade it at the IEC?
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GroovySauce Seasoned Member Posts: 915	Re: CSP3 ... fuses in the center of the circuit ... Reply #3 - 09/28/20 at 20:12:52 Just the IEC. I asked Steve about sending him some beeswax fuses to put inside my CSP3 when he was building it. He said that it's barely a difference. After some thought, I took a pass on having the internal ones beeswax and spent more money on records.
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piezoman Ex Member	Re: CSP3 ... fuses in the center of the circuit ... Reply #4 - 09/28/20 at 20:14:21 Thanks Groove, that's great info!
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piezoman Ex Member	Re: CSP3 ... fuses in the center of the circuit ... Reply #5 - 09/29/20 at 21:53:14 Groove, did Steve say anything about slow blow vs. fast blow for the 3 rectifier fuses [ two 500ma and one 6.3a I believe]? I'm pretty sure the main [IEC] fuse should be slow blow.
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GroovySauce Seasoned Member Posts: 915	Re: CSP3 ... fuses in the center of the circuit ... Reply #6 - 09/30/20 at 01:24:01 No, he didn't say what values or fast or slow. I also don't know the values and fast or slow blow on the 3 internal fuses. Are you thinking about putting in some aftermarket ones? 6.3A seems really high! If I recall correctly the IEC is a 3A slow blow for 115v.
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Lon

Seasoned Member

"Love without
guts is
worthless!"
Philip K. Dick

Posts: 25750

Q
Reply #7 - 09/30/20 at 01:34:24

You're right Brad, it's a 6.3. I found this post from Steve:

The small green board you see is a fuse holder that is directly soldered to the tube socket pins of the rectifier tube. It has three fuses. Two are 500 mA fuses that protect each leg of the high voltage against shorts inside the rectifier tube. Additionally there is another fuse protecting the heater windings for the rectifier rated at 6.3 amps.

These fuses protect the power transformer and the filter caps from any damage resulting from a shorting rectifier tube. Since there are several ways a rectifier tube can short we incorporated three fuses. Today where rectifier tubes are made in China, Russia, and Yugoslavia you are going to have shorts. Also since new many (NOS) new old stock tubes have been trading hands for in some cases over 60 years, they have been vibrated and beaten around to a point where many of them are more prone to shorting then when they were new, even though they have never been used.

If you are an avid tube roller, you are eventually going to blow one of these fuses. When it happens, be glad it did because without the fuses the power transformer and possibly the filter caps could have been damaged before the mains fuse had a chance to blow.

I use regular fuses in these, but there is no reason audiophile fuses that are not fakes shouldn't sound better. The thing with audiophile fuses you have to be careful of is that your spending $70 (for example) on something that is designed to blow up. My advise is do all your tube rolling with regular fuses until you find that one special rectifier tube that you can't live without and then if you want to use audiophile fuses that aren't fakes, by all means do so.

Steve

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piezoman Ex Member	Re: CSP3 ... fuses in the center of the circuit ... Reply #8 - 09/30/20 at 02:04:07 Lon, great post. I remember somewhere it was posted that Steve said slow or fast blow, it didn't matter. Frankly, I don't understand this. I imagine that if the main fuse is a slow blow, it follows the 3 fuses protecting the rectifier are slow low as well.....but I'm not certain.
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piezoman Ex Member	Re: CSP3 ... fuses in the center of the circuit ... Reply #9 - 09/30/20 at 04:23:10 Groove, I'm just going to purchase a few cheap glass fuses as backup to the 3 protecting the rectifier. I see no need to spend 6-800 bucks for 6 high end fuses (amp + preamp).
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GroovySauce Seasoned Member Posts: 915	Re: CSP3 ... fuses in the center of the circuit ... Reply #10 - 09/30/20 at 12:06:15 Lon. Thanks for sharing. Piezoman. Makes sense.
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