hoffy
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Posts: 35
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Post by hoffy on Nov 12, 2022 2:05:27 GMT -7
Hi everyone, have you got an idea why in the MK II series Maz 38 is not loaded with 6N14N like the Jr.?
I have also seen that Maz 18 MKII is biased colder than MK I. Is it so with the 38 version too? Older Mazes were reportedly biased at 14 watts per tube as I read somewhere here.
Thanks!
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Post by purpletele on Nov 12, 2022 6:55:49 GMT -7
Hi everyone, have you got an idea why in the MK II series Maz 38 is not loaded with 6N14N like the Jr.? I have also seen that Maz 18 MKII is biased colder than MK I. Is it so with the 38 version too? Older Mazes were reportedly biased at 14 watts per tube as I read somewhere here. Thanks! hoffy, My 38 MKII had 6N14N tubes. My amp was not a production amp, it was a bench prototype, but the 6N tubes were used when sent to me. It might have been availability at the time of going out the door. The Maz series amps are Cathode based, so there is no biasing required. As far as the 18 MkII being based colder than the MK I, then that is a function of a resistor value. I don't recall seeing any info on the MKII being set colder than the MKII. Do you have a MKII that sounds like it's off?
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hoffy
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Post by hoffy on Nov 13, 2022 3:49:30 GMT -7
I do not have a Maz yet but I would like to try one, MK II version possibly. When reading the specs of both 18 and 38, I noticed they have different power tubes. As far as bias is concerned, 6N14N should handle 14W of power dissipation whereas regular EL84s 12W, so what might be a little too hot bias for EL84s may be optimum for 6N14Ns and they should last longer.
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Post by perryr on Nov 13, 2022 20:02:32 GMT -7
MAZ18 MKI and II run the power tubes harder than a MAZ38, always has. That is part of the the ‘Jr’ character, and the 6n14n sound fab in that amp (standard 6n14n, not the 14watt variants). The MAZ 38 MKII with its quad, split load bias and slightly cooler operation sounds great with JJ’s or 6n14n. I have both amps, MKII’s, as well as a MKI Jr (in fact the very first Jr 0001). I ran those Russian 6n14n in my MKI 20 years ago, in fact many people likely did without even knowing it (GT, Sovtek, MojoTone were all selling them with their brands printed on them).
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hoffy
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Posts: 35
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Post by hoffy on Nov 14, 2022 0:59:32 GMT -7
MAZ18 MKI and II run the power tubes harder than a MAZ38, always has. That is part of the the ‘Jr’ character, and the 6n14n sound fab in that amp (standard 6n14n, not the 14watt variants). The MAZ 38 MKII with its quad, split load bias and slightly cooler operation sounds great with JJ’s or 6n14n. I have both amps, MKII’s, as well as a MKI Jr (in fact the very first Jr 0001). I ran those Russian 6n14n in my MKI 20 years ago, in fact many people likely did without even knowing it (GT, Sovtek, MojoTone were all selling them with their brands printed on them). I see, so 6n14n are not rated for 14W. Did not know that. Thanks.
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Post by perryr on Nov 15, 2022 0:34:18 GMT -7
MAZ18 MKI and II run the power tubes harder than a MAZ38, always has. That is part of the the ‘Jr’ character, and the 6n14n sound fab in that amp (standard 6n14n, not the 14watt variants). The MAZ 38 MKII with its quad, split load bias and slightly cooler operation sounds great with JJ’s or 6n14n. I have both amps, MKII’s, as well as a MKI Jr (in fact the very first Jr 0001). I ran those Russian 6n14n in my MKI 20 years ago, in fact many people likely did without even knowing it (GT, Sovtek, MojoTone were all selling them with their brands printed on them). I see, so 6n14n are not rated for 14W. Did not know that. Thanks. Sorry, I didnt mean to say it that way. The 6n14n comes in a few different versions, 6n14n, 6n14n-eb, 6n14n-ep, and probably others. The version without the suffix is the lowest rated of the versions. People often opt for the versions with a suffix because they can handle higher voltages and may be capable of producing an extra watt or 2… so when I referred to the “14watt variants” I was referring to those higher rated 6n14n. The ones Z uses is the lower rated, “standard” 6n14n, cause it sounds best (subjectively of course). regarding a 14watt bias point, i am not sure where my MAZ18 biases with 6n14n, with a ‘hot’, above average set I wouldnt be surprised to see 14watt. But on average, the 6n14n (standard) bias up a little cooler than any brand of EL84 I have tested (new or old). Another example, a friend brought over his Blues Jr amp, it is fixed bias and the chinese EL84’s were idling at around 13-14watts (with a 120v wall voltage). I grabbed a set of low current 6n14n and the idle dropped to around 9watts, without making any adjustments to bias. So the ‘grade’ of tube can make a difference. sorry for the long winded reply!
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hoffy
New Member
Posts: 35
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Post by hoffy on Nov 21, 2022 2:55:45 GMT -7
OK, so does anyone have an idea about how hot Maz amps are biased? How many watts of dissipation?
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Post by DRZ on Nov 21, 2022 8:05:50 GMT -7
OK, so does anyone have an idea about how hot Maz amps are biased? How many watts of dissipation? 18 and 38 RMS respectfully. Z
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