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In the Forum: Melquiades Amplifier
In the Thread: Valve Preamplifier for Macondo/DSET
Post Subject: I think you are done thenPosted by Romy the Cat on: 8/16/2020
Well, you can’t use Gogol Suite as some kind of reference in term of gain. The Gogol Suite was record by Pope Music at very high dynamic range they have very little compression. It feels like very soft volume recording as a result.
Architecturally for your system, considering that you have low voltage souses the 10Y sounds as a better solution. If you were able to make your 10Y to sound comparable to Placette then your preamp is operating very close to how preamps should sound and you do not need to look any further. Make sure that the fain you have from your preamp does not flood your input stage and does not max out your output stage. Is your AC voltage at input is under the DC voltage of your bias at 0dB digital level then you are all set. It is important do not drive the driver tube to A2 operation. The same goes with output tube, make sure that it does not go for A2 operation and it will clip very hard.
Another aspect. You know now what are the loads of your channels and they are fixed impedance. Now you need to assure that your amp is properly set power-vice. Drive your power amp at 0dB digital and max out your preamp. Let pretend that you are not clipping, add another preamp and make sure your power amp just beginning to clip. It is very easy to with a generator BTW. Now make sure that when your sinusoid gets clipped then it happens symmetrically atop and at bottom. Probably it will be the most applicable for your LF channel. Idle the LF channel as much as your power permits you (those drivers will sound better with less loading) and set if at symmetrical clipping. You can slightly adjust voltage and current of the output tube operation in order to moderate the top and bottom clipping. If happens the you have not enough power for your room drive the Milq LF in Pure Class A then you have a problem. Let me know if it’s the case. I predict that in your room and with the amount of you LF drivers you would be able to use Milq;s LF with no problems.
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