Carys

[speakerman1]

They are sending the meter today. I have a shaky pic of the amps at night. All my other tubes really glowed at night. These don't. Have to love burning in tubes. Every day is a new day.

Larry

 

[speakerman1]

Received the meter that they are proud of. LOL

Larry

 

[Pure_Brew]

Where does that go, somewhere on the amp? do you have to install it???

 

[speakerman1]

It plugs into the amp. Then you go down to 0 and go back up with no input or output.

Larry

 

[Pure_Brew]

I think meters are hot. I can use the EZ Bias/led settings on my amp but it seems prudent to use a multimeter. Would be nice to have.

 

[speakerman1]

They use a mic plug end. You plug it in. Not cheap my friend. 100.00 Gotta have it though. Do you need a DMM?

Larry

 

[laatsch55]

Biasing meter??

 

[speakerman1]

How do I explain this. Your tubes should work at a certain voltage depending where the bias is taken. On the Chinese amps I biased every tube to a certain voltage. These I just bias in one place in mV. I am still learning. These amps do not glow like the Chinese tubes did.

Larry

 

[laatsch55]

I noticed that too, even when I maxed em out on the horns, just barely glowed.

 

[speakerman1]

Yes and they had never been biased. They were running at twice the voltage.

Larry

 

[laatsch55]

So they should have sounded horrible.

 

[speakerman1]

Yes pretty bad.

Larry

 

[Rex Everything]

So they should have sounded horrible.

Noisy?

 

[laatsch55]

Very.

 

[speakerman1]

Testing them right now. Tubular Bells III will do the original in a bit . This is like I don't know what. Electronic music? Not a big fan of it.

Larry

 

[Skratch]

Larry, Does your Carys have 2 bias pots, one for left and one for rights and 2 1/4 in phono jacks for the meter leads?

 

[speakerman1]

2 bias places but a mic cord jack for the meter.

Larry

 

[Skratch]

So How many milliamps do they want you to bias them at? I normally bias 6550 and KT88 tubes around 50-60 ma per tube. If your underbiased your plates will sometime start to turn red and overbiased your amp will sound flat or thin.

 

[speakerman1]

175 mA. For the SLM 100s. That is if I remember right. I am almost certain. I am doing all 4 at one point.

Plus you will get harmonics if to high. One amp is at 175 now. The other is around 160.. Only been running a few days. Will recheck them tomorrow.

Larry

 

[Skratch]

Larry, With that setup you are biasing all 4 tubes at once. It is very important that all your tubes are matched. That seems a little low to me, but if that is what Cary recommends I would bias them to 175ma at the minimum. You can also put them on a scope and bias them more accurately