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In the Forum: Melquiades Amplifier
In the Thread: Planning my DSET
Post Subject: So far so good.Posted by Romy the Cat on: 1/31/2019
 anthony wrote:
Plenty of thought has gone into the speaker cables largely because there are plenty of them and I would prefer for them to be hidden completely from view.  Five of the six channels exit the amplifier in the well that fits around the horn stack pillar where they are nicely hidden, and the bass channel exits from the side closest to the Bass Cannons.  I've thought about different types of speaker wire from exotic to simple and in the end I have gone with simple Duelund 16GA tinned copper wire.  I've used this before with fullrange speakers and it is fine. 

Be careful with the speaker cables. The knowledge about the cables that you developed running a full range systems is not applicable running DSET. You do not need cable that run overall well. With DSET and very limited bandwidth you might go away with very cheap wires. You will find eventually the some of the speaker cables might be better but it would need a well matured system where sound will be observed in context of the given channel loading

 anthony wrote:
As discussed earlier I have gone for ammeters instead of voltmeters.  I can hit the mA target on all but one channel (F), but with exception of E (DHT Channel) they sure do wander about a bit, particularly the 6C33C channels.  Romy, is this normal?  I set them at about 240mA/150mA/150mA and they will go down over time and then they will come back up and past their original settings then they may wander down again.  Makes setting a stable current draw like herding cats. 

Sorry, I do not understand you. The 240mA/150mA/150mA is fine. As the tubes new they will run off a lot of current but after 20-30 hour of burn they will stabilize. Read my 6C33C Survival Guide.

 anthony wrote:
Here is Channel F.  It won't come over about 20-25mA.  Plus the DC Offset won't trim out less than about 0.27V (yes volts).  I have a feeling that the two problems are linked and will check to see where I have wired up the input filters for each channel.

You will find the bug, it is there. If you need to get extra 10mA then you might change the value of bias resistors.

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