Quickie + PJCCS - lost bass

[Paul Birkeland]

What voltages do you get at OA and OB?

[danielehn]

Will do a complete voltage check tomorrow and post the result. Forgot to shut it off earlier today and the batteries are getting a bit drained.(Recharging the 9v batteries now)

I really appreciate all the help.

[danielehn]

Hi,

Here is the voltages for my quickie.
================================
A1, 3,2V
A2 26,1V
A3, 0V
A4, 26,1V
A5 1,9V
A6 26,1V
A7 3,2V

B1 3,2V
B2 28,6V
B3 0V
B4 28,6V
B5 1,9V
B6 28,6V
B7 3,2V

T1 0V
T2 1,9V
T3 0V
T4 1,9V
T5 0V
T6 18,7V
T7 28,4V
T8 0V
T9 9,5V
T10 0V

PJCCS
================================
IA 38V
IB 38V
OA 26V
OB 29V

Resistance
================================
Terminal 1-5 , Just as described in the quickie manual
Terminal 6-10 , No connection at all

[Paul Birkeland]

Your voltages do look good. 

It's possible that there's a flaky solder joint giving you all this trouble as well, I've had a bad solder joint allow for proper voltages but awful sound on more than one occasion.

-PB

[Paul Joppa]

Since the tube voltages are OK, the problem is likely to be before or after the tube.

[danielehn]

Hi,

I discovered that if I tap one of the tubes when the amplifier is on, it doesn't give the clean ringing noise that the other tube does (makes a scratching sound). I replaced the tube and the sound improved a bit. Still a little lacking in bass but much better drive and sounds over all cleaner.

Much happier now   

Also finally switched the wiring to the d cells instead of forcing them into the holders. 


Could the lack of bass be some how be related to the sensitivity of the power amplifier?

[Paul Joppa]

Weak bass would happen if the power amplifier input impedance was low - say, 10K or lower. Or if teh 2.2uF capacitors were replaced with something smaller.

[danielehn]

I think it's actually fine now Just a tad thin sounding. But guess it's just as much the fault of the power amplifier (50k impedance).

I'm thinking about building an external tone control unit with 2x ALPS pots
"http://www.eleccircuit.com/wp-content/uploads/2010/06/Passive-tone-control-circuit.jpg"
I would solder decent quality cabling directly on it making it more like a cable with a tone control in the middle.

Is it a crazy idea ? , I don't want to fiddle around inside the quickie

[Paul Birkeland]

You would really want to put that in front of the Quickie, not between the Quickie and the power amp.

-PB