COVID, recessions, earthquakes...
Moderators: pompeiisneaks, Colossal
Re: COVID, recessions, earthquakes...
More power to you. Keep us posted!
I build and repair tube amps. http://amps.monkeymatic.com
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pompeiisneaks
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Re: COVID, recessions, earthquakes...
Oh no! Take care of yourself Tubedude! Get well fast.
tell us all about those builds though.
~Phil
tell us all about those builds though.
~Phil
tUber Nerd!
Re: COVID, recessions, earthquakes...
As I'm not sure where I'll be shortly and i have no energy for build reports, I'll show you some pics n descriptions
Stereo preamp i made for the Ricish bass build. It looks like hell but works well.
Stereo preamp i made for the Ricish bass build. It looks like hell but works well.
You do not have the required permissions to view the files attached to this post.
Tube junkie that aspires to become a tri-state bidirectional buss driver.
Re: COVID, recessions, earthquakes...
Sorry, pics are mixed up.
This new amp is a testbed for experiments with KT type tubes.
I started with a JTM 45ish output circuit. KT-66's @ 340V cathode biased, no feedback, 4k OT with the 4 Ohm feeding an 8 Ohm spkr to reflect 8k to the plates. Switched to nos Philips 6L6GC's with 4 Ohm spkr to see tonal changes. Power too low as the cathode bias eats power so I upped to KT-88's at both impedances. 4 Ohm mildly louder than 8 Ohm, but 8 Ohm better. Initially tried the choke fed supply, with another cap/choke for the screen etc. but it dropped plate voltage to 260V. Reconfiged to C-L-L-C to get plates to 375V. Many component value changes / wiring routing options. So it looks like a refried abortion but sounds great.
2 stage 6SN7 input impedance match circuit-Bass-Treble-6SN7a-Mid-Vol-12DW7 FX loop-6SN7b-6SN7 PI-KT88 pair.
I started with a JTM 45ish output circuit. KT-66's @ 340V cathode biased, no feedback, 4k OT with the 4 Ohm feeding an 8 Ohm spkr to reflect 8k to the plates. Switched to nos Philips 6L6GC's with 4 Ohm spkr to see tonal changes. Power too low as the cathode bias eats power so I upped to KT-88's at both impedances. 4 Ohm mildly louder than 8 Ohm, but 8 Ohm better. Initially tried the choke fed supply, with another cap/choke for the screen etc. but it dropped plate voltage to 260V. Reconfiged to C-L-L-C to get plates to 375V. Many component value changes / wiring routing options. So it looks like a refried abortion but sounds great.
2 stage 6SN7 input impedance match circuit-Bass-Treble-6SN7a-Mid-Vol-12DW7 FX loop-6SN7b-6SN7 PI-KT88 pair.
You do not have the required permissions to view the files attached to this post.
Last edited by TUBEDUDE on Sun Dec 20, 2020 12:55 am, edited 1 time in total.
Tube junkie that aspires to become a tri-state bidirectional buss driver.
Re: COVID, recessions, earthquakes...
Here's the nearly finished bass for the stereo preamp.
You do not have the required permissions to view the files attached to this post.
Tube junkie that aspires to become a tri-state bidirectional buss driver.