I'm glad you're enjoying it, see, it was worth the effort. Regarding the VR150 I'd like to say that when I used it with a resistor instead of the CCS (upstream) the preamp had a certain shhhhh noise. With the CCS that noise is gone.
Tempting. Maybe I should dig mines up. Congratulations Felipe
Thanks stajo🙂, let us know when you start your 26.
A discrete shunt regulator like the SSHV2, in my opinion, will shine when there's more variation in current, on account of its low output impedance. I've a big fan of shunt regs, as you may know, and I've dedicated a significant amount of time to improve on Salas' initial design. The VR tubes don't come close to the discrete shunt reg as far as low output impedance is concerned.
Edit: for a 4P1L, 6V6, D3A, or any other tube that draws more than 10mA current I'd be more tempted to use a discrete shunt reg. I think it'll behave better on transients.
Edit: for a 4P1L, 6V6, D3A, or any other tube that draws more than 10mA current I'd be more tempted to use a discrete shunt reg. I think it'll behave better on transients.
He is right, the shunt reg will measure better, it has much better line rejection. But do you hear the noise of the VR tube in this application?
Exactly. If you build a phono preamp using a D3A in the first stage then I would strongly recommend that you use a discrete shunt regulator.
And I'm sure that your phono is excellent! I have nothing but respect for your designs.
That being said, the regulation itself isn't what I was emphasising. Low noise and low output impedance supply is the real advantage from that particular shunt regulator. Imagine flat output impedance below 1mOhm, past 20kHz. Low noise you can get with chokes in the supply. Low output impedance too, but the chokes must be quite large to achieve that ($$). I never got a chance to compare, but I would not be shy to put a good discrete shunt regulator next to a choke supply for this particular application (phono+high-ish current input tube).
That being said, the regulation itself isn't what I was emphasising. Low noise and low output impedance supply is the real advantage from that particular shunt regulator. Imagine flat output impedance below 1mOhm, past 20kHz. Low noise you can get with chokes in the supply. Low output impedance too, but the chokes must be quite large to achieve that ($$). I never got a chance to compare, but I would not be shy to put a good discrete shunt regulator next to a choke supply for this particular application (phono+high-ish current input tube).
Hi!
I did compare and I prefer the passively filtered supply for transformer coupled stages. There the shunt regulator is fully in the signal path and has it's own imprint on the sound you get. Some might like that. I don't.
Just wanted to point out that it is not a necessitiy to use regulation with the D3a as your post implied
best regards
Thomas
I did compare and I prefer the passively filtered supply for transformer coupled stages. There the shunt regulator is fully in the signal path and has it's own imprint on the sound you get. Some might like that. I don't.
Just wanted to point out that it is not a necessitiy to use regulation with the D3a as your post implied
best regards
Thomas
I agree with you that regulation is not necessary and implication that it'd be was not meant. 🙂
Nice looking build Merlin.. 😀
About 12yrs ago I initially tried the VR150/0D3 in my early 26 based line stage design, but found the noise from the gas tube to be excessive in my application.. The plate to line transformers in question were UTC HA-133: 5:1 15K:600 which I am still using. The power amps had modest gain of about 10dB but were driving a rather efficient JBL speaker system (>100dB) wondering now whether I just had a batch of particularly noisy gas tubes.. (NOS) My opinion at the time was that it was almost quiet enough and had the speakers been about 6dB less efficient all would have been well.
My current speaker system is also over the 100dB mark so all of my electronics have to be extremely quiet.
About 12yrs ago I initially tried the VR150/0D3 in my early 26 based line stage design, but found the noise from the gas tube to be excessive in my application.. The plate to line transformers in question were UTC HA-133: 5:1 15K:600 which I am still using. The power amps had modest gain of about 10dB but were driving a rather efficient JBL speaker system (>100dB) wondering now whether I just had a batch of particularly noisy gas tubes.. (NOS) My opinion at the time was that it was almost quiet enough and had the speakers been about 6dB less efficient all would have been well.
My current speaker system is also over the 100dB mark so all of my electronics have to be extremely quiet.