I have a UCL11. The specs are:
Va = 200V
Vg2 = 200V
Vg1 = -8.5V
Ia = 45ma
Ig2 = 6ma
S = 9ma/V
Ri = 18KOhm
Ra = 4.5KOhm
Wo = 4W
Wa = 9W
The Ri seems low enough to use a 2.5K to 3.3KOhm transformer. Is that right?
Geek wrote:Here ya go!
(diagram corrected 26-5-14, 1200h PDT)
Geek wrote:Personally, I'd go with the lower Z and deal with less power for more linearity (IF the tube can handle 50mA continuous bias).
DeathRex wrote:Thanks Gregg. I need to learn how to do that.
DeathRex wrote:Wouldn't lower Z give me more power than a higher impedance?
dcriner wrote:The load impedance is the speaker impedance (which hasn't yet been mentioned) multiplied by the square of the xfmr turns ratio.
How does what internal resistance figure into what? In the case of speakers, impedances are normally stated at 400 Hz, and you can forget the DC resistance. If you are talking about the DC resistance of the xfmr windings, you can neglect that, too.DeathRex wrote:The speakers are about 6-8 ohms. I'm looking at an Edcor XSE15-8-3.5K or GXSE10-8-3.5K or GXSE10-8-5K.
At 45ma the Ra = 4.5KOhm. How does internal resistance figure into this? The UCL11 is 18KOhms, very close to the EL34's 15KOhms.
dcriner wrote:How does what internal resistance figure into what?
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