[[email protected]]

On Friday, March 30, 2018 at 7:55:54 AM UTC-4, Peter Wieck wrote:
Here goes the math again - into the Quads:

1 watt = 86 dB
10 watts = 96 dB
100 watts = 106 dB

35 watts = 98 dB
75 Watts = 103 dB


Maybe you want to run your math ONE more time. You claim:

75 Watts = 103 dB
...
100 Watts = 106 dB

Well, double the power results in a 3 dB increase in level,
assuming everything is reasonably linear. So how do you get
from 75 watts = 103 dB to 100 watts = 106 dB?

Assume, however, that 1 watt = 86 dB, the system is linear,
and that we're still assuming that dB = 10*log10(Px/Pref),
thus

1 Watt = 86 dB (Pref)
2 Watts = 89 dB
5 Watts = 93 dB
7.5 Watts = 95 dB (really 94.8)
10 Watts = 96 dB
20 Watts = 99 dB
50 Watts = 103 dB
75 Watts = 105 dB (really 104.8)
100 Watts = 106 dB

So the difference between 75 watts in and 100 watts in is NOW 3 dB, but
about 1 dB.

[[email protected]]

On Friday, March 30, 2018 at 10:56:35 AM UTC-4, wrote:
So the difference between 75 watts in and 100 watts in is NOW 3 dB, but
about 1 dB.

Sorry, that's "NOT 3dB, but 1 dB".

[Peter Wieck[_2_]]

On Friday, March 30, 2018 at 1:20:30 PM UTC-4, wrote:
On Friday, March 30, 2018 at 10:56:35 AM UTC-4, wrote:
So the difference between 75 watts in and 100 watts in is NOW 3 dB, but
about 1 dB.

Sorry, that's "NOT 3dB, but 1 dB".

We are looking at the difference between 35 watts (proposed) and "about anything else that is more", on the basis that the 100 watt solid-state amp in place does the trick. 35 watts is, and remains, woefully inadequate to drive those speakers to adequate levels without clipping badly at difficult passages.

If the OP wants to try tubes - a laudable effort - he needs to develop enough headroom to make the effort worthwhile. He may do that at the linked site (amongst others) within his budget using well made equipment available in GB. He will not do that with a 35 watt amp at any price.

Peter Wieck
Melrose Park, PA