HR Deluxe with 6V6 - Should I engage the 4 ohm tap ?

[Iplayloud]

I've already dropped a set of old RCA 6v6 and they sound fine with the negative bias voltage properly lowered. Now I was wondering if sticking a 1/4 jack as a plug with nothing soldered to it would be a good idea to engage the 4 ohm tap to deal with the primary impedence mismatch?

[Iplayloud]

Sorry for the triple post, it gave a strange error message and I kept trying How do I delete them ?

[pdf64]

I've already dropped a set of old RCA 6v6 and they sound fine with the negative bias voltage properly lowered. Now I was wondering if sticking a 1/4 jack as a plug with nothing soldered to it would be a good idea to engage the 4 ohm tap to deal with the primary impedence mismatch?

If you're cranking the power amp hard (which I suppose may have been the point of swapping to 6V6?), then yes, adjusting things to reflect a higher load impedance back to the 6V6 may be beneficial to their operating life.

Plus it may sound a bit different, perhaps better.

If you're just playing at lower power output levels, then it probably won't make much difference, it should be fine to use whichever arrangement sounds best.

[pdf64]

Sorry for the triple post, it gave a strange error message and I kept trying How do I delete them ?

Yikes when I replied, I got weird error messages too.

[pdf64]

Sorry for the triple post, it gave a strange error message and I kept trying How do I delete them ?

Yikes when I replied, I got weird error messages too.

[nosaj]

test

[Iplayloud]

Just to clarify, I meant sticking a 1/4 jack with nothing soldered to, as a plug... in the second speaker output. It's a switching jack that engages the 4 ohm OT tap.

[pdf64]

How strange, this thread is showing 0 replies?

[pdf64]

At least the error message when posting has gone.

[Iplayloud]

Just to have a less powerfull amp and a more useable volume range. Would you recommend changing anything else to the circuit if I leave the 6v6 permanently?

[pdf64]

As the loading on the heater circuit has reduced, it's worth just checking that the heater voltage hasn't increased too much. What the V AC do you measure between pins 2 and 7 of either output valve socket?
Apart from that I can't think of anything.

[Helmholtz]

Yes, you should.
Without doubling the load impedance the 6V6s will heavily overdissipate with signal even when biased cold.

[Iplayloud]

Wow never though about the lower load on the heater supply. Good news, I expected to read 7v and have to hook up the Christmas tree to lower it, but I read 6.0 VAC with the 6L6s and 6.2-6.3 with the 6V6s. Perfect !