Recent content by danfishinman

Perhaps, but I have already built a 100w bass amp and I have found that the filament hum is easily controlled with a hum balance pot and the place you need the absolute cleanest DC (besides the B+ is the Bias supply.

Here's what I got so far.. stock single channel pre-amp except the last stage has an added gain stage. KOC splitter, Power and Hammond Iron. https://www.dropbox.com/s/1pxlf6dqtxhu8qe/DV300-V1.pdf

Re thinking my plan to use stock PSU and go with KOC design. KOC PSU uses a Hammond 717 for Va(6550 plates - 710volts) and Hammond 272DX for Vs (6550 screens - 410volts). Stock PSU only has 350V screen supply. KOC specs 1K-5W screen resistors and no plate resistors. I just need to adjust the...

Yeah that balance control seemed interesting but I figured with the indidiual bias contraols I should be able to dial-in the same effect. it's that gain stage to the grids that is the missing section in KOCs design that why i'm looking at boosting the last stage of the stock pre-amp. Although...

This is my second build using Kevin's design for inspiration and some of his design tips. (I built a 100watt B15 using lots of guidance from his books) but i haven't built an exact KOC design yet. I'm looking at building his 'simplified' SVT from TUT3 but his pre-amp seems way to simple to...

curious, on the VR .. what do they do with the other half of that 12AU7 ?

Yeah thats basically the same circuit as the 6C4 stage. on the earlier versions of SVT just trying to figure out if it has enough gain to adequately drive Kevins splitter design here: V2 here is 12AX7 and Voltage at Vp2 is approx 400v Also I'm only building channel 1 and dont plan on...

hope you are still tracking this thread... I am about to attempt the same build using the stock Ampeg pre-amp but Kevin O'connors 'simplified' SVT Power amp with the schmitt splitter as shown in TUT3. the problem is that the Kevin's power amp/spliiter has less gain and he recommends that the...

Thanks for the advice. I'll call my local library tomorrow.

with piano accompaniment. We have the Bass sheet but not the piano part and the music is out of print. Anyone ? My son has a recital in 2 weeks.

meant to say 6SL7

yep I switched to JAN-Philips 6SN7 from Sovtek. Huge difference.

thanks for the replies do far.. yep I did try a search but the results were pretty bad .. apparently my key word selection for this topic was off .... that's why I started the thread again.

I just pay-per-viewed the movie Towerheist last week ... the movie was OK but the opening theme had the most INCREDIBLE double bass tone I have ever heard... yes it's on iTunes. This is my new target tone.

Ok so my dodge durango ( yeah it's got a hemi ) is great for haulin my son's double bass but 13 mpg is killing me. Any suggestions for a more economical vehicle that won't require resting the neck on the dashboard ?