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Dark Voice 339 - Page 90

post #1336 of 2438

Sorry.  This is why I shouldn't post at 4AM when I can't sleep, I end up reasking the same question.  What actually prompted the question was a PM that I should fix/make new adapters because those tubes don't go well with the current power tubes.  I think I could probably use the originals as templates and solder new adapters, but I'd rather not risk shorting something if I traced a wire wrong.  I'm not sure why, but when I adjusted one adapter yesterday, it would screw up the other.

 

I think I'll try the 6SJ7GTs from Tube Center .  Maybe I'll get lucky and get the Tung-Sols.  Unfortunately, none of the places I've looked let you specify the brand and E-Bay only has one available.  I think Wall-E (or maybe Telecaster) said they're all pretty decent, just not as good.  The RCA reds are a little rich for my blood, unless any of the others out there are rebranded RCA reds.  I'll keep using the stock tubes until I get the new resistors in, though.

post #1337 of 2438
Quote:
Originally Posted by BackwardPawn View Post

Sorry.  This is why I shouldn't post at 4AM when I can't sleep, I end up reasking the same question.  What actually prompted the question was a PM that I should fix/make new adapters because those tubes don't go well with the current power tubes.  I think I could probably use the originals as templates and solder new adapters, but I'd rather not risk shorting something if I traced a wire wrong.  I'm not sure why, but when I adjusted one adapter yesterday, it would screw up the other.

I think I'll try the 6SJ7GTs from Tube Center .  Maybe I'll get lucky and get the Tung-Sols.  Unfortunately, none of the places I've looked let you specify the brand and E-Bay only has one available.  I think Wall-E (or maybe Telecaster) said they're all pretty decent, just not as good.  The RCA reds are a little rich for my blood, unless any of the others out there are rebranded RCA reds.  I'll keep using the stock tubes until I get the new resistors in, though.
I have both the rca 5693 reds and the tungsols 6sj7gt with mesh plates ...the rca sounds darker , warmer and more tubey..the tungsols are all about air and soundstage and details... I prefer the latter..although the rca is really good also!
post #1338 of 2438
Quote:
Originally Posted by hifimanrookie View Post


I have both the rca 5693 reds and the tungsols 6sj7gt with mesh plates ...the rca sounds darker , warmer and more tubey..the tungsols are all about air and soundstage and details... I prefer the latter..although the rca is really good also!

That just made the decision even harder because the DT880s are pretty bright, so dark and warm balances them out.  But you're the second person to say you prefer the Tungsols.

post #1339 of 2438
Quote:
Originally Posted by BackwardPawn View Post

That just made the decision even harder because the DT880s are pretty bright, so dark and warm balances them out.  But you're the second person to say you prefer the Tungsols.
Dont forget..keyword is 'mesh plates' biggrin.gif
and ps..they are hard to find. rolleyes.gif
post #1340 of 2438

I'm picking up my RCA 6SJ7WGT tomorrow, which are Tung Sol made mesh plate tubes.

 

 

 

I'll let you know if I prefer those over the RCA RED 5693. For know I prefer the TFK EF80.

Btw, all 5693 Red tubes were made by RCA no matter what the label says
 

post #1341 of 2438

Good day, I´m a new owner of a LF339, but it come with 220 volts and 110 volts is my home (Brazil), so I´d like someone to let me know the WATTAGE OF THE TRANSFORMER 110 par 220 volts, I need to buy. I do not understand electricicty, any help will be appreciated, thanks.


Edited by leonelfrederico - 1/24/13 at 1:18pm
post #1342 of 2438

Why didn't you order a 110 version from yuking?

post #1343 of 2438
Quote:
Originally Posted by Ultrainferno View Post

I'm picking up my RCA 6SJ7WGT tomorrow, which are Tung Sol made mesh plate tubes.

I'll let you know if I prefer those over the RCA RED 5693. For know I prefer the TFK EF80.

 

 

Damn, one 6SJ7WGT is humming like mad, asked for an exchange. While I was there I picked up another pair of matched RCA 6AS7G, just because I could rolleyes.gif

post #1344 of 2438
Quote:
Originally Posted by leonelfrederico View Post

Good day, I´m a new owner of a LF339, but it come with 220 volts and 110 volts is my home (Brazil), so I´d like someone to let me know the WATTAGE OF THE TRANSFORMER 110 par 220 volts, I need to buy. I do not understand electricicty, any help will be appreciated, thanks.


So you have to use step-up/down transformer to convert the 110 volt to the 230V required for your amplifier.
I measured my amp and the power consumption is about 95 Watts /230V with (5998/CV1067) but with stock power tubes could be even higher because their filament draws 3A of current each.
Is recommend using transformer with a max watts rating that is at least 50% higher than your appliance but appliances such as amplifiers require a converter 2-3 times or even more the watts that the appliance is rated for.
A higher watts rated transformer will never damage your amp, however if you buy one that is not strong enough, will damage the voltage converter, and may damage your equipment !

From what I remember my lf339 have one wire each, coming from transformers which is not connected with the mains if this is extra primary windings? so it may by use to set-up the right voltage for your country.
I suggest to contact Yuking first and ask him it is even possible(does it have the extra wire for 110/230V?) if yes you could avoid extra additional costs associated with purchasing step-up/down transformer BTW not cheep converter.

post #1345 of 2438

Translated with google: LEONELFREDERICO - Rio de Janeiro, Brazil.

THANK YOU FOR THE REPLY, you are confirming what I began to understand, and searching the WEB, I need your information to confirm others
because my knowledge of electricity were ON / OF, and I am afraid of damaging the LF339.
 
I was told by a member of the Brazilian Head-fi, taken care of, because the Brazilians are 110 volts 127 volts actually being that quality of electricity in Brazil is very bad because of significant fluctuations of voltage, which could damage the component "sensitivity" of the LF339. So I avoided that risk, I'll buy a voltmeter and see what happens in my house.

I checked forum LITTLE DOT: MK8 power consumption 110 V.A; MK6: 25 V.A; MK3: 30 watts; LITTLE DOT MK2: 28 watts.

The power consumption of the little dot mk 8 would be very close to the LF339: 95 Watts, and they are two amplifiers in one, comparing with MK2 and MK3, to get an idea.

1) You advise me to use a transformer supplying 500 WATTS OR MORE, so I would be safe as well as not to damage the amplifier, which I would link the two power cords for LF339 - TOGETHER IN ONE TRANSFORMER - and not a transformer for each? (I know it will sound stupid...) These represent the 95 watts TOTAL POWER and should not be multiplied by 2, since it is LF339 Dual-Mono: two in one?

I have sent an email to yuking, but I had a hard time explaining what I wanted, since I knew exactly what I wanted, not idea what it was doing "power consumption", etc., and it is not easy to communicate, I'm waiting for a response.

2) Does anyone know what the "tolerance" of the LF339 in terms of the amount of voltage 220 volts, because I saw that the track has LITTLE DOT MK 220 up to 240 volts announced in the datasheets?

If you have experience with Brazilians use 220 volts running without problem?

3) Could anyone tell me if the LF339 is considered:

"resistive load" (just resistance, like a lamp or a heater) in case the "power consumption" in WATTs = V.A. (Volt. ampere),
or "inductive load" (with capacitors for operation: fan, fridge), in which case V.A. (Volt.ampere) = Power (Watts) / Power Factor? (Coefficient).

If the LF339 is "inductive load", what would the coefficient of "power factor"? ( It will not look stupid ), I think just to yuking answer?
It is these data that would determine the exact power consumption of the amplifier to choose the right power transformer in V.A. being that there are no oscillations "Brazilian" voltage on the network, if I understood well.
 
The Brazilians and others who are interested in the taxes on imports LF339 can communicate with me "using the particular."

Any information would be welcome, if I get significant data yuking, they will be reported.

Thank you.

 

post #1346 of 2438
300w adapter is enough for 339
post #1347 of 2438

1) The 95W was a total, both section of amp ON combined power outlets.
I did another measurement with different set of tubes (7236&5693) and the result is similar.
Power voltage AC 233.1V, 96.9Watt or 114V/A and power factor is 0.850
As you see already Xmdkq(Yuking) confirm that 300Watt (real watts not V/A!) converter could be enough.

2) The voltage tolerance in tube amps should not be so much critical i mean +/- 10-15V is acceptable.For eg. if the voltage power is less/or more then the acceptable tolerance it will affect the output voltage the same happened to the filament which are directly AC heated from transformer( there is no     
regulator to compensate the difference in voltage)
But some step-up/down transformer like my one have the input voltage regulated by switching the jumper in steps of 10V so you can adjusted the output voltage required to power your amplifier.
 

post #1348 of 2438

Hello,

A link to the desired voltage from "possible" wire inside the amplifier, it is difficult for me at the moment (although I imagine it to be extremely easy, I MEMORIZE FOR LATER, may be). However, in the future I plan to buy the DIY project Bottlehead crack + speedball, then yes, ... I WILL HAVE LEARNED.
You are confirming and adding information, I am VERY, VERY, VERY GRATEFUL, now I'm more confident because I AM WELL SEEING THE TECHNICAL SIDE. I will communicate all that to confirm yuking "accurate data", so I can choose across SECURITY. I think I'll opt for the transformer 110/127 volts to 220 volts (around 300 Watts or 300 / 0, 85 V.A. (Volt.Ampere = Brazilian nomenclature.) And check the voltages in my house to fit with the LF339. I'm telling on a VOLTAGE REGULATOR to have a tension "... exact ..." 220v.

Whatever the solution, I am grateful for the data communicated and  THANKS FOR THE HELP.
 

post #1349 of 2438

OK, yuking (xmdkq) ... 

post #1350 of 2438

You're welcome.
 

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