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In the Forum: Melquiades Amplifier
In the Thread: Bias help
Post Subject: Update , bais and high passPosted by DA on: 2/3/2014
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A little update on the Milq amp.After sorting some of the problems with the amps transformers (see posts above ) .I now have two mono blocks operational that have about 700 hours ,I'm so glad hour meters were installed .
Filament voltage is spot on 6.3v.
Plate voltage is low 190V / 185 mA as I decided not to change it yet because I want to live with it for awhile and then try using half 6c33c .it is apparent that power is not an issue with my speakers and room size.
Bais lines are 197 v. Gas tubes draw about 10mA . Now here is my first question - how to make them draw 20 - 25mA ? R11 R12 ?
The second question has to do with how to unload the Milq from low frequency < 60hz ? How to or where to install a low pass filter ?
As you can see I have not commented on the Milq sound and there are reasons for that,you see my system (and room ) are new and in the long process of building , assembling , tuning and more tuning .... All I can say is that is is possible that this is the last system I will build , yes it is that promising !
Some details on the speakers which are based on the Macondo Axioms.
Bass. - old 15 " pioneer driver in sealed 110 liter box. Will be replaced
Upper bass - 125hz horn 4"throat fane 8m
Lower mid fundamental - 220hz horn 4" throat wizerless lowther pm6a. Experimental
Mid - 410 hz horn. JBL 2440
High. - not sure yet
Best regards
DanielRerurn to Romy the Cat's Site