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Old 11th April 2008, 07:47 PM   #1
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Default My 6S19P Linestage

Haven't sketched out the schematic but it's pretty simple. One 6S19P per channel in GC. 3K+4.7K in parallel to bias at -40-45V ~22mA or so. Bypassed by a 150uF 63V 105 degree 'lytic, and a .22uF 630V film. 63V is a bit close but the grids shouldn't swing that much since they're being fed by a CD player.

Anode load is a 6K 10W resistor. Output RC is 4.7uF Solen (peeled and painted with heat-resistant enamel after too many soldering iron scars) and 470K. Volume control is an Alps Blue Velvet.

PSU: Two 6.3V 6A transformers back to back, one of the CT's grounded. Voltage doubler with 2 UF4007's, 2 450V 100uF caps, with 220K in series to balance voltage. 10H 65mA choke into 220uF, then 500 ohms and 100uF, and a channel split with 350 ohms/47uF each.

The preamp is dead quiet (after I realized I had to connect chassis ground to mains ground to kill huge hum), aside from the microphonic 6S19P's. Does anyone thing the -EV type would be worth it?

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Old 11th April 2008, 08:23 PM   #2
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you know what?

that's really fugly!

that biggest pic is worth

sound?
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Old 11th April 2008, 08:42 PM   #3
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heh thanks! i dunno about the sound but so far I notice that the bass out of my 6.2W amp is kicking so much more butt than before...
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Old 12th April 2008, 06:46 PM   #4
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Hello,

have you measured the gain of your preamp?

Reinhard
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Old 12th April 2008, 07:21 PM   #5
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I've typed the tube characteristics into TubeCAD and expect that it's around 2.
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