AMZ FX ANALOG ALCHEMY GEOFX MEF ROG MEF DIY WIKI

tube boost only making noise

Started by hobo_hephew, June 24, 2011, 05:16:57 AM

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hobo_hephew

June 24, 2011, 05:16:57 AM
I tried building the "pentaboost" with the 5672 sub mini tube, in series with a 5840 tube. Built them separately for easier debugging.
The 5840 boost works great, but the 5672 just makes really bad noises if not powered by a battery, and I've used several capacitors for filtering.
Anybody else had problems with the 5672 tube? Tripled checked my build and measured so that all voltages are as they should.

R.G.

#1
June 24, 2011, 11:48:00 AM
Debugging: What to do when it doesn't work
R.G.

In response to the questions in the forum - PCB Layout for Musical Effects is available from The Book Patch. Search "PCB Layout" and it ought to appear.

Govmnt_Lacky

#2
June 24, 2011, 12:06:39 PM
This might not have to do with the problem you are describing but...

How are you running the 2 sub-mini tubes on BATTERY power?  :icon_eek:

When I built Rick's (Frequency Central) Thermionique, which is a 5840 tube-based project, it was pulling 150mA just for the heater of ONE tube  :o

How are you getting away with battery power for TWO TUBES??
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hobo_hephew

#3
June 24, 2011, 06:16:28 PM
I've only run battery power for the 5672 as a single boost, not for the two tubes together. they are connected only by wire for the signal

iccaros

#5
June 25, 2011, 12:00:29 AM
This is a directly heated tube, any noise on the heaters will directly carry over

hobo_hephew

#6
June 25, 2011, 06:40:58 AM
So a more substantial filtering for the power is what I need?
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