Resistors - opinions

[Sven]

Greetings,

Reply from SBE (manufacturer of Orange drops), quote:

Your best bet is to purchase PS series and bend the leads out.

Rationale
1) other polyester film foil series will have different film widths, thus the lenghts will be different, which may your audio applicaiton
2) the lead attached is different between the 192P, 470P and PS.
3) your volumes will be too small for a custom build.

You will not find 470P's in distirbution, they are only being sold to OEM directly, not enought demand for distribution. You will be able to find 192P's and PS's in small volumes via distributors.

end quote.


All the best,

Sven

[glasman]

Interesting topic. I spoke with SBE yesterday on the topic of RoHS compliancy.

While I was on the phone with them I asked about distributiors for PS series caps and they quoted CE distribution as being about the best (and really only) choice for purchasing them.

I didn't have the nerve to ask them the quantity for a run of caps. I bet it would at least 50000, maybe even 100000+ pieces.

Regards,
Gary

[Funkalicousgroove]

Gary, Give me a call, I may be interested in going in on a run with you.

RE: Paper in oil

I have a pretty good stock of non-inductive Japanese audiophile quality PIO caps that I use for tweed fender builds, and can offer a comparison>

I built myself a pretty Dead-on 5F6-A as close to the original as humanly possible(PIO caps, CC resistors, Hot Molded Carbon Pots, NOS tube sockets, GE 5AR4, Tung-sol tubes, fish paper boards etc.) and had an opportunity to directly compare it with a Victoria 45410 and here is what I found:

When we cranked both amps the one I built had a smooth Euphonic breakup reminiscent of Paul Kossoff (Yes I was playing a les paul) the highs were smooth and not piercing, the lows were rumbly but coherent, In contrast, The victoria got very buzzy and grainy when we cranked it, the highs were piercing, and the lows stayed pretty tight.

I was able to plug into the bright channel of my amp and turn it up most of the way, the highs were brighter, but not the typical Icepick-in-the-ear, the Victoria was just the opposite.

at low vilumes the two amps were nearly Identical, but the response of the Victoria with Orange Drops(custom made they say??)was much faster, and the amp sounded distinctly new. My amp had a slower response much like a real tweed, and sounded much older in comparison, even though it only had 3-4 hours on it at the time.

My take on this is that the PIO caps would be far too mellow in a blackface or Dumble circuit, and in that type of circuit would probably result in a dark, dead sounding amp. that's my $.02

[fabiomayo]

Terrific comparisson, Funk.

The reason I keep asking about theses PIO caps is that - believe it or not -
I can find them much more easily than Orange Drops (any series...). I think
I can find Xicon MPP locally but since I'm importing a lot of stuff I'll order the
caps too...

[Funkalicousgroove]

maybe we can work out an exchange, You send me some PIO's and I can send you whatever you want from the states, I need some PIO's in smaller values, I can only seem to find them in .02 or larger.

[fabiomayo]

I'm sending you a PM, Funk.

[glasman]

Be careful shipping the Xicon MPP to Europe, they are NOT RoHS compliant. They may get hung up in customs.

Gary

[glasman]

Gary, Give me a call, I may be interested in going in on a run with you.

I actually tried your desk today, but guess you might have been at lunch.

Gary

[Hotrod Ford]

Be careful shipping the Xicon MPP to Europe, they are NOT RoHS compliant. They may get hung up in customs.

Gary

Gary, Brasil is not in Europe

[Funkalicousgroove]

LOL!!!! Gary, Call my cell, If you don't have it (Pretty sure you do) send me an email.

[David Root]

I just completed a Fenderstyle amp, my mandatory "homage to Leo" I guess. It runs about the same voltages as a 6G11-A brown Vibrolux, and it is that circuit with a 12AT7 non-optoisolator reverb added in place of the normal channel, plus a separate third stage preamp (i.e. the reverb has its own recovery triode). There are multiple gain controls and a bass dump and gain boost footswitchable too.

It uses PIO caps exclusively in the direct signal path, all NOS hermetically sealed types, and sounds great, very detailed in clean to early distortion (somewhere between blues and blooz, if you know what I mean).

Full distortion mode is less clear, but good with a bit more (variable) NFB and bass tone control cut. This is in an open back cabinet, so it's not going to be all that tight no matter what you do.

Resistors I have been using, and which are all over this amp, are 1W metal film, PRP GP type, (Precision Resistive Component Inc., General Purpose type) everywhere except plate resistors and the 68k input resistor, which use 1W Riken carbon films. These are good modern carbon films, not like that cheap Xicon crap. The PRP metal films are very good and quiet, and way smaller than the Riken 1Ws. Nice thing about them is you don't have to worry about where you put them, they are rated 750V! They cost about $0.70 each if buy a mixed 100, including shipping, so they they ain't expensive either. US made, too.

PRP also have a non-magnetic "audio" grade resistor, PR9372, which doesn't seem to be much more expensive than the GP type, if at all. 1W are 500V rated. Have not tried those.

[lastwinj]

I didn't have the nerve to ask them the quantity for a run of caps. I bet it would at least 50000, maybe even 100000+ pieces.

Regards,
Gary

its much lower than you think. i believe minimum putup is $500-600 per value.

germ