Systemic Development > Tubes

Problem with specs on new tubes

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Mike L:
I received the JJ E34L tubes today for my Consonance Cyber 800 monoblocks.  These require 4 power tubes each.  When I ordered them via the phone from parts connexion I had specified the details.  When I look at them today they are matched as if I were to be installing them in different systems (matched quads instead matched octs)  4 are matched 35, 34, 35, 35 and 4 are matched 42, 43, 42, 44.  

I am totally new to tubes and don't know what Ip means or what an acceptable tolerance is etc.  Now would it be possible to use 2 of the higher valued tubes along with 2 of the lower value tubes on one monoblock and the remaining on the other, or is that totally messed up?

Another question is in regards to amp biasing.  I have no idea what that means and if it applies to push/pull amps or if this is exclusively a SET thing.

Thanks,
Mike

PS. I don't have the manuals

WEEZ:
Can you adjust bias with your amp?

I wouldn't be happy with those values, if it were me.

WEEZ

Mike L:
I don't know as I do not have the manuals.  I will email Opera Audio and ask.

Should all of those numbers be identical.  For example if I only did need 4 tubes would 42, 43, 42, 44 still be acceptable.  

They sell them as matched pairs and yet I got charged additionally for the matching.  The invoice states

 4       MP(matched pairs)             xxxx unit price          (4)xxxx price

 8 unit ordered      matching quads  xxxx unit price        (8)xxxx price (these are charges just for the matching)

Pay for matched pairs and then pay for matching quads....seems like a double charge for matching and they all don't even match.

Thanks for your input,
Mike

Mike L:
:lol:  :lol:   Here's a kicker.  I just realized one of them is an entirely different tube  JJ 7591 S.  My first time ordering from parts connexion.....not really leaving a good taste in my mouth.

Mike

WEEZ:
Mike,

First off, I would try to obtain a manual for your amps..to determine the bias proceedure and/or IF you have an adjustable bias amplifier. (if it IS adjustable; there should be bias controls near the output tubes in the form of screwdriver adjustable pots.

If the above is the case, you COULD use them as you stated (except for the one 'clinker') but I wouldn't.

Second, I'd call Parts Connexion and tell them the situation (that they screwed-up, basically) and you want to obtain a quad that matches the quad you're keeping.

It's not like you're returning rare NOS tubes, or anything. They should work with you on this.

Is there an Opera Audio dealer or distributor near you?

WEEZ

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