Treble pot on RF #102

[M Fowler]

Where is the schematic or layout for built in Dumblelater for my extra tube socket?

[didit]

This was the best my slow grazing has turned up -- http://ampgarage.com/forum/viewtopic.ph ... 15#p241117.

Overall it was good thread for me to build understanding ahead of building.

Best .. Ian

[M Fowler]

Yeah that was an impressive build.

[aflynt]

Dunno if this helps, but here's a layout of the original version of the amp I built from the thread above.

Sonorous Sublime.pdf

I've since realized that I actually used a 1M for the master not 250k. I've made a bunch of changes to the amp since then, though.

-Aaron

[M Fowler]

Nice layout thank you.

[norburybrook]

Indeed.

Is that a belton reverb brick in there?

marcus

[M Fowler]

Indeed.

Is that a belton reverb brick in there?

marcus

Check out this link for more info on reverb. http://ampgarage.com/forum/viewtopic.ph ... 15#p241117

[aflynt]

Indeed.

Is that a belton reverb brick in there?

marcus

Yes. It's actually using 2 v2 Belton bricks in parallel blending two differently filtered reverbs. Sounds great for always on reverb as long as you don't have the effects loop send cranked too high. I've actually moved over to a configuration where I'm using the loop return as another gain stage and the circuit as it stands can't handle that output level without distorting. Running it at 24 Volts gives the dry signal enough headroom, but the reverb signal still will distort. I plan on revisiting this circuit when I get a chance using the V3 brick, padding/recovering the wet signal and adding some dwell.

-Aaron

[Funkalicousgroove]

The treble pot in 102 when I worked on it was a mouser/alpha 250k linear that measured 236K. Before it was converted to a skyline EQ it would have had the fender 30% ish pot. The mid and bass pots were also Mouser, 250k 15%, and the bass pot measured 400K.

[mikeram]

Thanks Brandon. That clears a lot up.

Mike

[llemtt]

..The mid and bass pots were also Mouser, 250k 15%, and the bass pot measured 400K.

Can you confirm that when you worked on it the bass pot was a mouser?

There's a pict of the amp (also here, not remember where) after skyline upgrade where the bass pot wasn't clearly marked mouser/alpha. It looked more like a late 70's guitar CTS pot with some side stamping. (eventually replaced later)

Thanks
Teo

[Mark]

The treble pot in 102 when I worked on it was a mouser/alpha 250k linear that measured 236K. Before it was converted to a skyline EQ it would have had the fender 30% ish pot. The mid and bass pots were also Mouser, 250k 15%, and the bass pot measured 400K.

A 250K pot measuring 400K is very strange as I doubt the pot would have been used enough to get the wear to increase the value that much. The other option is that the pot was opened and material was removed from the wafer.

I assume that you have experimented with this, did the pot value really make much difference?

[ijedouglas]

The treble pot in 102 when I worked on it was a mouser/alpha 250k linear that measured 236K. Before it was converted to a skyline EQ it would have had the fender 30% ish pot. The mid and bass pots were also Mouser, 250k 15%, and the bass pot measured 400K.

A 250K pot measuring 400K is very strange as I doubt the pot would have been used enough to get the wear to increase the value that much. The other option is that the pot was opened and material was removed from the wafer.

I assume that you have experimented with this, did the pot value really make much difference?

I would agree but I think that may be a typo on the bass pot. The bass pot should be a 500K that probably measured low at 400K. In the pic I have (after skyline conversion) it had a CTS pot for the bass.

[jrdamien]

The treble pot in 102 when I worked on it was a mouser/alpha 250k linear that measured 236K. Before it was converted to a skyline EQ it would have had the fender 30% ish pot. The mid and bass pots were also Mouser, 250k 15%, and the bass pot measured 400K.

A 250K pot measuring 400K is very strange as I doubt the pot would have been used enough to get the wear to increase the value that much. The other option is that the pot was opened and material was removed from the wafer.

I assume that you have experimented with this, did the pot value really make much difference?

For treble pots, changing the value can shift the frequency range of what’s cut or boosted. It’s one of those things that you don’t always notice unless you’ve got a good side-by-side comparison

[erwin_ve]

The treble pot in 102 when I worked on it was a mouser/alpha 250k linear that measured 236K. Before it was converted to a skyline EQ it would have had the fender 30% ish pot. The mid and bass pots were also Mouser, 250k 15%, and the bass pot measured 400K.

A 250K pot measuring 400K is very strange as I doubt the pot would have been used enough to get the wear to increase the value that much. The other option is that the pot was opened and material was removed from the wafer.

I assume that you have experimented with this, did the pot value really make much difference?

I would agree but I think that may be a typo on the bass pot. The bass pot should be a 500K that probably measured low at 400K. In the pic I have (after skyline conversion) it had a CTS pot for the bass.

For history's sake: