WTB: 20/22/30/33 uF filter caps

[StrummersOfThunder]

Just checking on the off chance anyone has a stash of axial 450v/500v filter caps.
Ideally 2 x approx 20uF and 1x approx 30uF. Or just three 3 x approx 30uF

Managed to leave one set off my order from amplifed parts.
Or are there any sneaky local supplies that anyones found?
I see nz tube has a small array but not quite what I need.

Mouser/digikey/rs online do have options but I thought id see whats in the communal supply chain.

[MikeC]

Just checking on the off chance anyone has a stash of axial 450v/500v filter caps.
Ideally 2 x approx 20uF and 1x approx 30uF. Or just three 3 x approx 30uF

Managed to leave one set off my order from amplifed parts.
Or are there any sneaky local supplies that anyones found?
I see nz tube has a small array but not quite what I need.

Mouser/digikey/rs online do have options but I thought id see whats in the communal supply chain.

Best I can do is these - brand new 40uF/500v Spragues. They're NOS - PM if they suit.

[StrummersOfThunder]

Just checking on the off chance anyone has a stash of axial 450v/500v filter caps.
Ideally 2 x approx 20uF and 1x approx 30uF. Or just three 3 x approx 30uF

Managed to leave one set off my order from amplifed parts.
Or are there any sneaky local supplies that anyones found?
I see nz tube has a small array but not quite what I need.

Mouser/digikey/rs online do have options but I thought id see whats in the communal supply chain.

Best I can do is these - brand new 40uF/500v Spragues. They're NOS - PM if they suit.

Thanks mike
Might be a bit heavy for a 6g2?
Anyhow i might just combine the purchase with a new solder station and get free shipping.
Man, how great would it be if we had a local comprehensive supplier of amp parts!

[MikeC]

Just checking on the off chance anyone has a stash of axial 450v/500v filter caps.
Ideally 2 x approx 20uF and 1x approx 30uF. Or just three 3 x approx 30uF

Managed to leave one set off my order from amplifed parts.
Or are there any sneaky local supplies that anyones found?
I see nz tube has a small array but not quite what I need.

Mouser/digikey/rs online do have options but I thought id see whats in the communal supply chain.

Best I can do is these - brand new 40uF/500v Spragues. They're NOS - PM if they suit.

Thanks mike
Might be a bit heavy for a 6g2?
Anyhow i might just combine the purchase with a new solder station and get free shipping.
Man, how great would it be if we had a local comprehensive supplier of amp parts!

Yes it would indeed.
If caps are for power filtering and you have a diode rectifier the values should be fine.
Physically fitting them on the board might be a problem, hence ruler in pic.

[StrummersOfThunder]

Best I can do is these - brand new 40uF/500v Spragues. They're NOS - PM if they suit.

Thanks mike
Might be a bit heavy for a 6g2?
Anyhow i might just combine the purchase with a new solder station and get free shipping.
Man, how great would it be if we had a local comprehensive supplier of amp parts!

Yes it would indeed.
If caps are for power filtering and you have a diode rectifier the values should be fine.
Physically fitting them on the board might be a problem, hence ruler in pic.

The 6g2 has 30/30/30 for filtering.
I was going to go with a cap can but i want to do smarter grounding .
I plan to add back up diodes to the rectifier if that helps at all

[MikeC]

5U4G valve rectifier max capacitance - see attached.

[TmcB]

5U4G valve rectifier max capacitance - see attached.

Hey Mike, have you wrapped your head around load lines? Tube data sheets are the next frontier for me and I am not yet understanding quite what they're telling me

[MikeC]

5U4G valve rectifier max capacitance - see attached.

Hey Mike, have you wrapped your head around load lines? Tube data sheets are the next frontier for me and I am not yet understanding quite what they're telling me

No, not really - haven't got into "design from the ground up stuff" as there are so many examples of things that have already been done. There's a number of online calculators for working out gain, cathode bypass caps etc & you can plug in various different values/voltages to see what happens/changes. Perhaps Jaret of Rectified Amps has skills in this department.

[StrummersOfThunder]

5U4G valve rectifier max capacitance - see attached.

Hey Mike, have you wrapped your head around load lines? Tube data sheets are the next frontier for me and I am not yet understanding quite what they're telling me

No, not really - haven't got into "design from the ground up stuff" as there are so many examples of things that have already been done. There's a number of online calculators for working out gain, cathode bypass caps etc & you can plug in various different values/voltages to see what happens/changes. Perhaps Jaret of Rectified Amps has skills in this department.

Im following the fender schematic
calls for 30/30/30 uF caps and a 5y3gt rectifier .
I was thinking of three 20uF caps. But maybe one 30uF and 2 x 20s. Apparently there are early drawings of the 6g2 with 3 x 20uF.
There are just as many newer 'revised' schamatics using gz34s etc

[StrummersOfThunder]

Seems that there is fairly good going concensus that fender changed his mind about the foltering on the 6g2 after the schematic was published.
Lots of exaples of factory amps with 20/20/20 cans, and many builders reporting better 'sounding' amps with schemes like 32/16/16 (similar to 5f6 etc)

I think im going to use to 30mF for the preamp filter cap and follow it with 20/20.

[MikeC]

Seems that there is fairly good going concensus that fender changed his mind about the foltering on the 6g2 after the schematic was published.
Lots of exaples of factory amps with 20/20/20 cans, and many builders reporting better 'sounding' amps with schemes like 32/16/16 (similar to 5f6 etc)

I think im going to use to 30mF for the preamp filter cap and follow it with 20/20.

A fairly big part of the filter cap decision is what the rectifier can reliably stand - hence the specs.

[TmcB]

Seems that there is fairly good going concensus that fender changed his mind about the foltering on the 6g2 after the schematic was published.
Lots of exaples of factory amps with 20/20/20 cans, and many builders reporting better 'sounding' amps with schemes like 32/16/16 (similar to 5f6 etc)

I think im going to use to 30mF for the preamp filter cap and follow it with 20/20.

A fairly big part of the filter cap decision is what the rectifier can reliably stand - hence the specs.

Can that circuit take a GZ34? Up 60uf room on that

[MikeC]

Higher voltages out of a GZ34. You'd have to examine the circuit and see if those higher voltages are a problem. Dunno off the top of my head. PS The 6G2 schematic I looked at had a 5U4G rectifier. So Ant's needs to determine the correct schematic!

[StrummersOfThunder]

Seems that there is fairly good going concensus that fender changed his mind about the foltering on the 6g2 after the schematic was published.
Lots of exaples of factory amps with 20/20/20 cans, and many builders reporting better 'sounding' amps with schemes like 32/16/16 (similar to 5f6 etc)

I think im going to use to 30mF for the preamp filter cap and follow it with 20/20.

A fairly big part of the filter cap decision is what the rectifier can reliably stand - hence the specs.

Can that circuit take a GZ34? Up 60uf room on that

I have seen it described. Would you not risk loosing some of the 'charm' of that circuit by the gz34 being comparatively 'stiff' ?
the 6g3 seems to call for a GZ34. Id like to make two amps that are quite differing from each other but in the same family.
Given thousands of 6g2 amop shave been produced with 5y3 and 30/20/20 or 20/20/20 or other similar variation of filtering what issues am i running into?
Presumably its just the first capacitor that needs to be under the max capacitance of the rectifier , not the total capacitance of the filter brigade?

[StrummersOfThunder]

https://schematicheaven.net/fenderamps/ ... _schem.pdf