Which Bluesmaster Should I Build?

[pompeiisneaks]

Is that "Metalized PolyPropylene vs PolyStyrene"?

~Phil

[Colossal]

Is that "Metalized PolyPropylene vs PolyStyrene"?

~Phil

Yes, metallized polypropylene.

[stelligan]

I like the idea of the PAB on with the OD. several guy's have done this but have put toggle switches on their pedals so they can go either direction When you get the amp up and running you want to dial in the HRM stack with the PAB On and the main stack out.

I second this - nice to turn PAB on and off on the clean side but, seems I never use OD without PAB.

[dorrisant]

I think MPP is just OD 715/716 series
If you need any board drawings, I can send them to you in any convenient format. There are also detailed photos of all the stages of my Bluesmaster build, of course if it can be useful.

Yes, I'd be very interested in anything you might want to share... Thank you for the consideration! tony@volitionamps.com

Once I get this all sorted I will post a layout and matching schem and will offer board sets here. My intent is to have them fit the CE chassis.

As regards the caps, would any of the part numbers from this link be appropriate?

https://www.ttiinc.com/content/ttiinc/e ... citor.html

Edit: The only two that are metalized are the 725M series which are rated at 160v, and the 425 are rated at 200v. So, no.

[erwin_ve]

Is that "Metalized PolyPropylene vs PolyStyrene"?

~Phil

Xicon has a MPP(Xicon MPP series) = Metalized PolyPropylene
A similar size cap with a bit more smoothness on the top end is Cornell Dubilier CDE DME series= Metalized Polyester.
Both are very different from the 715P series soundwise.

[erwin_ve]

Once I get this all sorted I will post a layout and matching schem and will offer board sets here. My intent is to have them fit the CE chassis.

I already made a board set for a CE chassis. https://ampgarage.com/forum/viewtopic.php?f=2&t=32804
Just saying...

[dorrisant]

Once I get this all sorted I will post a layout and matching schem and will offer board sets here. My intent is to have them fit the CE chassis.

I already made a board set for a CE chassis. https://ampgarage.com/forum/viewtopic.php?f=2&t=32804
Just saying...

I don't mean to step on toes...

[talbany]

Is that "Metalized PolyPropylene vs PolyStyrene"?

~Phil

Xicon has a MPP(Xicon MPP series) = Metalized PolyPropylene
A similar size cap with a bit more smoothness on the top end is Cornell Dubilier CDE DME series= Metalized Polyester.
Both are very different from the 715P series soundwise.

Erwin is as always right on
IMO.. Xicon MPP's Polypropylene's have an aggressive sound with a bit more top end bite to them. These will give you a Marshallish type flavor. The metalized polyesters are a smoother cap with a slightly flatter top end. Pressed caps (Like the Xicons) generally have a tighter more focused sound than the more rounded unpressed caps do like the 716's and PS caps Dumble uses in his earlier gen amps. With an aggressive type amp with plenty of gain you generally want tighter bass and focused mids..IMO This also helps promote things like sustain-ability bloom and feedback etc. Dumble has been known to combine the 2 like using the MPP's in the HRM stack and 715's in the PI. I've also seen him use all MPP's. This is all of course personal preference. I am sure Dumble has his recipe
BTW. The Sozo's IMO are nice caps (although require some break-in time) but also have their own sound. Every Time I've tried them in a Dumble style amp it pulls me further away from that Dumble sound I am chasing. You might like them you might not??..Dunno?
BTW.The MPP's will smooth out some over time and use.
Tony

[dorrisant]

So, these?

https://www.mouser.com/Xicon/Passive-Co ... rfZ1yp7zip

They are soooo cheap!

[talbany]

Dumble approved Pressed Caps

Xicon Polypropylene
https://www.banzaimusic.com/Xicon-MPP-0-047uF.html

MPP.gif

NTE Polyester

NTE.jpg

https://www.hawkusa.com/manufacturers/n ... cfEALw_wcB

NTE's are hard to find I got mine on Ebay

Tony

[didit]

Hello --

Are these not "the thing", or perhaps they don't really take orders -- https://www.ntepartsdirect.com/ENG/PROD ... M_630_VOLT ?

Best .. Ian

[pompeiisneaks]

Hello --

Are these not "the thing", or perhaps they don't really take orders -- https://www.ntepartsdirect.com/ENG/PROD ... M_630_VOLT ?

Best .. Ian

NTE still exists, I've bought all kinds of new stuff from them at local stores etc (fry's, vetco electronics) It seems they make a lot of clones of older products as well like fets, opamps etc that are clones of older things as well.

I don't know, though, if their New caps are made in the exact same way as say the ones HAD uses.

~Phil

[JD0x0]

I think Panasonic ECQ are comparable to the Metallized PE
https://www.mouser.com/ProductDetail/Pa ... vhg7KKs%3D

Panasonic ECW are for the Metallized PP
https://www.mouser.com/ProductDetail/Pa ... mdwg%3D%3D

Yeah, metalized caps are generally pretty cheap. They're self healing, smaller and cheaper than the film/foil but I think my ear generally prefers the Foil/foil over metalized construction, though both can sound good.

[rootz]

Any love for the CDE DMT and DME caps? I use the latter when things get thought or when wiring feedback networks or a deep switch. Small, convenient, but not sure if they sound very different from e.g. a 6PS in the same application.

[dorrisant]

Any love for the CDE DMT and DME caps? I use the latter when things get thought or when wiring feedback networks or a deep switch. Small, convenient, but not sure if they sound very different from e.g. a 6PS in the same application.

Seems like a comparison may be in order.

As Tony mentioned before, some of these caps would require a burn in. I think I could do that. We have jam sessions in my shop 1-3 times a week and there is no shortage of volunteers. Maybe I could get each set of caps burned in and take a day to do some comparisons by swapping cap set and using a looper to play the same tracks through each. Comments?