Fantastic
Well-Known Member
Here is an update.
I added a simple two stage tube preamp with a 12AU7( ECC82) tube at the input of the preamp. This is not considered to be a very linear tube compared to several others that are available. However I had it and it is/was used by some preamp manufacturers.
The combination sounds very nice and there is hardly any degradation due to hiss and hum. Since it is a feedback less design and running wide open, it will add noise and hum to the SMSL50 which by itself is totally noiseless.
I can now hear faint hum and slight hiss right at the speaker drivers. From two feet away nothing is audible.The preamp has an ac heater which does often introduce some hum compared to a dc heater supply though it is quite low. I'll need to measure all this later on.
Right now the SMSL50 sounds terrific.Fantastic value for money. It's night time here and I'm still playing it pretty loud. Tomorrow I'll play it still louder till it clips and see what happens ! Earlier it appeared to be a bit lightweight in the bass but now with the preamp it sounds fine.
I added a simple two stage tube preamp with a 12AU7( ECC82) tube at the input of the preamp. This is not considered to be a very linear tube compared to several others that are available. However I had it and it is/was used by some preamp manufacturers.
The combination sounds very nice and there is hardly any degradation due to hiss and hum. Since it is a feedback less design and running wide open, it will add noise and hum to the SMSL50 which by itself is totally noiseless.
I can now hear faint hum and slight hiss right at the speaker drivers. From two feet away nothing is audible.The preamp has an ac heater which does often introduce some hum compared to a dc heater supply though it is quite low. I'll need to measure all this later on.
Right now the SMSL50 sounds terrific.Fantastic value for money. It's night time here and I'm still playing it pretty loud. Tomorrow I'll play it still louder till it clips and see what happens ! Earlier it appeared to be a bit lightweight in the bass but now with the preamp it sounds fine.