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I ended up at .072 bias because above that they get pretty muddy on the 2 hi gain channels. So .036 per tube is where I decided to leave it. It gets really loud now and it has a nice controllable breakup on Any channel just by turning up the volume a little bit. It's probably a little hot for...

Thanks

Tha Thanks that's what I was thinking, I knew 60 for both was very cold for two tubes in A 60 Watt amp , this one is - 57 negative voltage. And that sounds about right for 60 Watts. I'm not sure about the math with that negative voltage but what you are saying sounds right to me.

My neighbor was gone so I decided to try out the amplifier again today with the JJ tubes biased up At 70 ma for the pair. It Sounded flat again to me just like before at 57 ma. , I decided to try changing the pre amps and splitter to better ones to see what they could do to help with the flat...

I put the bias up to 70 on the JJ tubes and they sound a lot better than At 57 . But when I was in there I decided to try some other matched tubes. I had a Vintage NEC Red plate and A Vintage GE Red plate and two Vintage RCA tall bottles Red Plate. So four of the tubes were not good enough to...

I'm working on A Fender DeVille 60 Watt amp with two 12's Eminence speakers. Before I got it someone put new JJ output tubes in it and fender pre amp tubes. Sounded a little bit flat to me so I decided to leave the pre amp tubes alone for now and change the output tubes to better ones and see...

I have 3 out of four 45 tubes already and I was thinking about building a 45 tube PP amplifier. Two of the tubes match so I could go fixed bias if I can match the other tube. The other thing was I was wondering about was if I can use a 6v6 PP amplifier for the iron and tone stack ? It has a...

Yes But I have black box plates 6C4 now. I like RCA black plates but I don't think they compare to The Telefunken's and Mullards or Even Amperex Holland.

F Foil getter tubes any brand Are mid 1950's usually and They usually demand higher prices. Around 1948 after WW2 The 12AX7 was Born to the new generation. I'm pretty sure they had them before that but were used for the War only. Now that We have them I must admit that they are almost...

Check out these 6L6 GA that I found in my stash today , Sylvania

Has a 300 number under the Octagon stamp

W What do they sound like ? Nec definitely looks like the same tube.

This is A 6L6 GC black plate realistic. The Realistic stamping is over The RCA Octagon stamp ? gold pins and 5 hole steel reinforced side plates ? Top getter also ? Never seen a RCA like this one before. They definitely appear to be RCA smooth black plates but with 5 holes instead of 3 holes...

Sorry that I took so long to answer but They sent the capacitor to the wrong address and it took awhile to get it.

I think that it would have worked but I had already ordered the right capacitor for it. I installed it and it ended up that The motor was jammed up and it would move some and then stop, So I worked it by hand for awhile and it came loose and it is working now and I lubed everything up real good...

They can sound pretty good The old Tung Sol 5881 industrial tubes. I have a pair Push Pull in my 58 Seeburg 161 Jukebox. Much cheaper than RCAs also. But not as good in my opinion.

I put The Two New CBB61 Capacitors in as replacements for The Dual Oil Can Capacitor .75/1.65 VAC and the motor went a Few inches fast and then it stopped ? It Seems to me like it might be a polarity issue of some kind going on ? I was thinking about using two diodes from what was the C terminal...

Someone said to just get a El 84 Amplifier and forget about it , I don't know if 100 Watts is possible with EL 84 or not but I have to agree that it is a much cheaper option than 7868 that can sound good. I have an Old Lafayette El 84 Amplifier that was made by Madison Fielding that was just as...

From doing restoration work I like The 7868 tubes and 7591 earlier version. I was a big El 34 and 6L6 Guy from playing guitar amps and for that they are still good choices but for good Home Audio I have to say 7868 is the best. The Fisher 400 (7868) and Ambassador (7591) have proven to me that...

The 12AU7 half idea is a interesting idea for down the road if I live that long ! .

I found a rebranded Mullard black box plate for 15 dollars, CEI England. 1E5-126 etching on it. It's a little bit bigger box , I'm thinking that it must be a later model Mullard black box plate. I heard a sound difference immediately for the better than the grey box plate 6C4 Mullard that was in...

Too big of Capacitors (.1 ) in the Bass box was the problem. Thanks for all your input on it. You got me thinking about what it possibly could be. It was a long time ago but I didn't tell you what fixed it.

I've been trying to find one for less than 50 dollars and it doesn't seem possible ? . That seems pretty insane to me for a single triode tube. I have two 100 Watt Bogen Models CBH 100 that use them as splitters before the 7868 tubes. One has a Mullard black box plate and the other one has a...