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Old 17th December 2004, 02:19 AM   #1
cominup is offline cominup  Viet Nam
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Default 6V6GT and 6L6GT

Dear all,

Now I'm considering to choice between 6V6 and 6L6 for my new amp, they are very common and easy to have in my county rite now.

I've got a pair of SE-OPT; pair of 12ax7 (5741); Power Transformer 110~530-0-530.

After analysed their technical detail, I guess that B+ is 250V, so 6L6 will get more power than 6V6; But this is just only the number and the most impotant is quality of sound. Pls, tell me about your feeling about those power tube; anything about your experience when building them.

Thanks for your attention and looking for your response,

Cominup
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Old 17th December 2004, 02:43 AM   #2
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Humm,well,they are both great tubes..
Personally I'm kind of partial to 6V6's,but 6L6's are great too!
How large are the output transformers? any other info on them? (impedance,UL tap,etc?)
Do you know the current rating of the power tranny?
Hmm,Guess I'll vote for 6L6,unless you have really efficient speakers..
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Old 17th December 2004, 06:18 AM   #3
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Yes, both are really great tubes. But before I recommend one over the other, I too would like to know the primary Z of your transformers. A 6V6 will not be happy with less than 10K on its plate at 250V, while a 6L6 does great in SE at about 5K.

( For an experiment, triode-strap a 6L6, you'll only get about 1.4 watts, but the sound is to DROOL over )
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Old 17th December 2004, 06:54 AM   #4
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Oh Man,

It's so confusing then I've already bought a pair 6V6 and 6Pi33C (~6L6; but cheaper 4 times).

I'm planning to built two amp. One uses all Russian tube (6H2Pi and 6Pi33C) and another uses all American tube (GE 5741; 6V6). Russian tube ofcouse will be more powerfull than American. But another matter, I've got only one pair of OPT!!!!

It's really confusing another time, dudes!!!! In my mind, I love to build American first, I feel that it more matches with my OPT.

About OPT, it comes from 2nd Japanese amp and one exprienced man said that it full enough to use with 6L6 I dont know how to check them!!! If you know, could you teach me how??? It's so kindly!!!
Impedance: OK, I'll check tonight soon,
UL tap: means????,
Current rating???etc....

Could you tell me more detail, dude???

And then, I've read on http://www.triodeel.com/6l6gc_p1.gif, there are some term I do not understand:

1. AF Amplifier Class A1: AF what stands for?
2. Different between Fixed Bias and Cathode-Bias
3. Triode connection: it means 6L6 pentode becomes triode, its'n it? In this case, how about the effect??? Warmer, finer or noiser?
4. I noticed that when +B is at 250V, 6L6 seem working very well, is it true?

OOOOHHHHH!!!!! Tooo much question guys!!! Its overflow to write Eng.

Well, C u guy tomorrow, OK!

Cominup
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Old 17th December 2004, 08:01 AM   #5
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Quote:
Originally posted by cominup
Oh Man,

It's so confusing then I've already bought a pair 6V6 and 6Pi33C (~6L6; but cheaper 4 times).
Great! IMO, 6P3C sound better than 6L6G. Keep in mind the plate rating for 6P3C is 25 watts, same as 6L6G, not the 30 watts of 6L6GC.

Quote:

UL tap: means????,
Ultra Linear. A tap on the primary at ~40% up the winding. You tie it to your screen. Has added benefits like 2/3 the power of pure-pentode operation, but 2/3 the sound clarity of triode-strapping.

Quote:

Current rating???etc....
Know the watt rating and physical size of the core? That'll give us a clue.


Quote:

1. AF Amplifier Class A1: AF what stands for?
Audio Frequency

Quote:

2. Different between Fixed Bias and Cathode-Bias
Fixed bias means the cathode is either directly grounded or grounded through a low-ohm (10 ohms typical) resistor and a variable negative voltage is applied to the control grid (g1) through the grid-leak resistor (typically 33k to 220k, depending on amplifier class).

Cathode bias means the required bias voltage is developed across a high-ohm (typically ~500 ohms, 5 to 10 watts) resistor inline with the cathode and bypassed by a largish capacitor (typically 470-1,000uf) and the grid-leak resistor is grounded.

Quote:

3. Triode connection: it means 6L6 pentode becomes triode, its'n it? In this case, how about the effect??? Warmer, finer or noiser?
PRO:
More linear reproduction, sounds much more "tubey" than pentode or UL.

CON:
Lower power out, less power sensitivity, less efficient.

Personally, I'll take a triode-strap over pentode or UL anyday

Quote:

4. I noticed that when +B is at 250V, 6L6 seem working very well, is it true?
Perfect for a 6P3C

Rule-of-thumb: American tubes can handle higher voltages and less current and Russian tubes higer current, but lower voltages. This is thanks to the Russian typically using larger cathodes than Americans.
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Old 17th December 2004, 08:14 AM   #6
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Default Re: 6V6GT and 6L6GT

Quote:
Originally posted by cominup
I've got a pair of SE-OPT; pair of 12ax7 (5741); Power Transformer 110~530-0-530.
Erm.. FWCT rectified, that transformer will bring about 700V.

What kind of OPTs do you have? 6L6 and 6V6 aren't compatible if you want anything below 50Hz

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Old 17th December 2004, 08:42 AM   #7
cominup is offline cominup  Viet Nam
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Default all of you are cool guys!!!!

Thanks to all,

I'm so excited to build this amp. Rite now, I've still got some problem with power supply (I'm buiding a pre-amp use two 6H2Pi, it works but so hum, the reason is from Power Supply). So after I solve this one, I will begin immediately American amp. But first I should check my OPT to let you know and tell me it's cool enough, OK?!!!

You guys live in US, you are real sleepless guys; What WT is rite now??? Your eyes be like this Ha ha!!!!!
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Old 17th December 2004, 09:25 AM   #8
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Quote:
Originally posted by cominup
I'm planning to built two amp. *snip* But another matter, I've got only one pair of OPT!!!!
Easy! Adapt an old octal tube socket or whatever to the bottom of your OPT's and then you could plug them into whichever chassis you are using at the time. Or even into another amp you might build in the future. Might look a bit odd but should work just fine.
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Old 18th December 2004, 10:46 AM   #9
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Poor me,

My OPT are 2.5KOhms ~ 8Ohms and 600Ohms.

What tube does it fit to??? So busy today!!!!
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Old 18th December 2004, 08:28 PM   #10
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Quote:
Originally posted by cominup
My OPT are 2.5KOhms ~ 8Ohms
6L6, definetly. Is there a power rating? If it's too small it might be good for only a 50C5...

Quote:

and 600Ohms.
Is this a secondary output tap or the other OPT's primary?

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