How about polystyrene caps, as either treble or plate snubbers? I have poly OD snubbers in my Dumbleized 6SL7 amp.
Polystyrene caps are much more efficient at amplifying those higher frequency's to my ears...5k-10k range so if you want some serious sparkle on a fender clean style amp with single coils 100pf bright cap goes a very long way..Iv'e never tried them as coupling caps and don't think they would sound good...
jelle wrote:They sound very 'open' which can be great. :D
Thanks.. I have a hard time finding the 600v ones..Although I never really looked very hard... Open can be a good.... I know they are smooth..Do you have a source?.. Keep me from lookin/... Thanks,,
Also in regards to the ceramic snubber caps on V2,
Am I right in that a snubber cap on a preamp tube is to smooth the tone a bit?
What effect does going larger with the value bring?
Say I have 270pf in there now, if I changed these for 390pf, what would I notice?
Thanks
BTW, here is a pretty good article on using snubbers on a SS power supply.
Also in regards to the ceramic snubber caps on V2,
Am I right in that a snubber cap on a preamp tube is to smooth the tone a bit?
What effect does going larger with the value bring?
Say I have 270pf in there now, if I changed these for 390pf, what would I notice?
Thanks
BTW, here is a pretty good article on using snubbers on a SS power supply.
They take some high end off. increasing the snubber values makes a very small but noticable difference in tone and usually warms it up a bit.
I like to use "uneven" snubbers, i have a 330pF on V2a and a 680pF on V2b. IMO this gives a nicer tone rolloff and givesthe amp more "chirp" definition
It's true i've lost my marbles and i cant remember where i put them
I went from 270pF to 680pF, on OD1 and OD2, both polystyrene. Because I'm using a 6SL7GT in parallel in place of each 12AX7 triode, the Zout is so much lower because the 6SL7 in parallel has a 22K plate resistance vs. 62.5K on a single 12AX7 triode (approximately) and so you have to boost the puffs to get the treble rolloff point.
Nice and smooth, especially on the bridge pickup, but needs a little bit of treble boost on the neck and more on the middle position, unless cranked out. There is a sweet spot out there and I'm getting close. 75.4K to ground off the 310K OD entrance trimpot (nominal 350K, not even close) with a 120K prior resistor and a 33K makeup resistor to ground off the trimpot.
Thanks guys.
Yeah, I've been trying to read up on snubbers or puffs as they are sometimes called.
I thought I had read that they help take off the fizz on the OD and smooth the top end.
So if I increase the 270pf ones I have now, say to 390pf will it shave more top end off or less? I'm thinking more.
I wish I knew how to run that SPICE program but listening is always best.
Maybe I'll tack a few different values in there and listen.
Something I read, can't remember where now, was how much the lead length on caps can change the capacitance, especially on the ceramic disc caps.
But what I don't understand is even if the leads are kept short, wouldn't the wires soldered to them do the same thing?
Jelle,
Those sure look like the ones in my link.
May I ask why you would use those in the locations they are instead of orange drops?
Or did you just happen to have them at hand?
Very nice looking build!
768]http://i608.photobucket.com/albums/tt16 ... DSguts.jpg[/img]
