Quad 34 preamp tilt pot resistance ?

Zigis · 16th March 2010, 05:29 PM

Anyone now Quad 34 preamp RV2 and RV3 pots value? Tilt and bass regulators. In schematics are only RV2 and RV3 a and b, no nominals.
My idea is building original tilt and bass schematic from scratch.

speaker dave · 16th March 2010, 07:16 PM

Were they pots? I remember a 5 or 7 position switch.

David

Zigis · 16th March 2010, 08:03 PM

I don't now, newer see in real life. I see in schematic, look like pot:
http://www.dc-daylight.ltd.uk/Valve-...ic-Circuit.pdf
If you say it is switch, probably it is similar like stepped volume control. Important to know total impedance.
Maybe if there are some Quad owner, can measure.

Mooly · 17th March 2010, 01:54 PM

Quote:

Originally Posted by speaker dave

Were they pots? I remember a 5 or 7 position switch.

David

Think that was the Quad 44 that used the switch.

Looking at the circuit I would guess at 47 or 100k for the "hf" pot. Easy enough to try and see which one gives the correct response.

Johnny2Bad · 8th September 2010, 03:13 AM

Uptilt/Downtilt is a rare but not unique feature of some gear; besides QUAD it was common on Luxman preamps, integrated amps and receivers.

Broadly speaking the amount of adjustment was small; maximum tilt would be on the order of +/- 1 dB to +/- 2dB.

16th March 2010, 05:29 PM	#1
Zigis diyAudio Member Join Date: May 2005 Location: Riga, Latvia	Quad 34 preamp tilt pot resistance ? Anyone now Quad 34 preamp RV2 and RV3 pots value? Tilt and bass regulators. In schematics are only RV2 and RV3 a and b, no nominals. My idea is building original tilt and bass schematic from scratch.

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16th March 2010, 07:16 PM	#2
speaker dave diyAudio Member Join Date: Nov 2009 Location: Toronto	Were they pots? I remember a 5 or 7 position switch. David

16th March 2010, 08:03 PM	#3
Zigis diyAudio Member Join Date: May 2005 Location: Riga, Latvia	I don't now, newer see in real life. I see in schematic, look like pot: http://www.dc-daylight.ltd.uk/Valve-...ic-Circuit.pdf If you say it is switch, probably it is similar like stepped volume control. Important to know total impedance. Maybe if there are some Quad owner, can measure.

8th September 2010, 03:13 AM	#5
Johnny2Bad diyAudio Member Join Date: May 2010	Uptilt/Downtilt is a rare but not unique feature of some gear; besides QUAD it was common on Luxman preamps, integrated amps and receivers. Broadly speaking the amount of adjustment was small; maximum tilt would be on the order of +/- 1 dB to +/- 2dB.

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