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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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It is currently 21 Feb 2019, 04:23

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 Post subject: Re: 6CY7 Stereo Amp
PostPosted: 25 Jun 2018, 04:42 
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Joined: 28 Dec 2017, 05:13
Posts: 7
Location: Maryland, USA
Suncalc wrote:

I hope this helps.


Very much so. Thanks for taking the time to explain all that.

Suncalc wrote:

It was only after thinking about it for a while that I realized that a simple 3dB difference in speaker sensitivity meant the spearers only sound half as loud. By the time you get to a 6dB difference it's really shocking how little sound comes out of an insensitive speaker. This is one of the reasons that today, most people recommend simple high sensitivity drivers (mid 90dB range) for these small SETs. I routinely use small 2-way bookshelf speakers with sensitivity of about 90dB with this amp for casual listening.


Until I built the 4S and the Lacewood, my tube "experience" (or lack thereof) was mainly cobbling together low-wattage guitar amps. Some years back I had built a Fender Princeton style circuit in a head for a friend to use in his studio. I think it ended up in the 4 to 7 watt range. I remember how shocked we were at how loud it was hooked up to a 4x12 Marshall cabinet loaded with Celestion Vintage 30's. I just looked up the specs on the Celestions, and they are advertised at 100db sensitivity. This explains a lot.

Anyhow, now I have a great excuse to build another set of speakers. :up:

Thanks again Matt


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