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Can anyone suggest how many hours F-5002 OPT needed to be break in?I am using them for 100Hrs, they still sound muddy, not much detail and lack of focus and airy as it should be.
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It may not be the transformer. Also, what impedance is the transformer primary?
The F-5002 is 3K ohms primary.
Hi!
Very strange! Details should be much. Dirties should not be. What at you the circuit of amplifier?
What modes of a output tube?
VlaUga
I am using Sunaudio SV-300B-BE circuit with TJ mesh plate 300B output tube.Right now my amp sounds like it doesn't show the advantages of parts I used, this might be something wrong. I got to find out.
Hi VL,what do you think of tango nc-20f interstage, how does it compare to the tamura interstage.
I am having an amp built 417a > tango nc20f > 300b> tamura f-5002.
The tamura interstage spec is limited bandwidth upto 15000khz only.
Was wondering if you had heard either?
But ears listen to music. They do not measure frequency of a sound...:)
I heard transformers NC20 from mister Hirata.
I did not hear transformers NC20F from company ISO.
But transformers TAMURA STU5K sounding more interestingly (more living) transformers NC20 from mister Hirata.P.S. I love a sound of transformers X60-3.5S from mister Hirata. These transformers like me more, than many output transformers TAMURA for me.
Hi,stu5k is a Sakuma special transformer?
So ihave the choice of either nc20 or stu5k.
And using F5002 for output......
For me STU5K sounded more interestingly than NC20 from mr. Hirata at work on 300B.
At use with other lamps other result is possible.If at you less "capacitor" lamp, than 300B can quite be, that NC20 will give the best sounding. But in any case NC20 a worthy choice for F5002.
But details in both transformers more than enough and to compare of them on this parameter there is no sense.STU5 - it is simply special transformer TAMURA.
Why SAKUMA? Itself TAMURA it so like does not specify.
Hi,That's true ears do listen. I was just wondering if that interstage of tamura sounds more smooth with less details than the tango.......
Hi!It not the best circuit for the high resolution transformer.
The circuit (input trans 1:4... 5 - tube mu 20...30 - IT 1:1...2 - TJ300B - F5002) is more preferably.
Also it is necessary to look mode of output tube.
The current of a output tube should not be big, possible value 65 mA.
"The circuit (input trans 1:4... 5 - tube mu 20...30 - IT 1:1...2 - TJ300B - F5002) is more preferably."Can you suggest which circuit is matched with my OPT and where I can find it?
"The current of a output tube should not be big, possible value 65 mA."
Yes, I run my 300B at 60mA.
Hi!Not the problem to draw the circuit of such amplifier.
Whether you are ready to go on the big expenses?
It is important to be determined with components. They should be the best quality, that is correspond F5002. Condensers should be BG WKZ. Displacement of tubes should be fixed. Intercascade transformer Tamura SS-351.
The entrance transformer also should be the highest class, it is better that it simultaneously would carry out a role of a regulator of loudness, as for example transformer S*B TX102. The first lamp should be very transparent, but on the other hand enough powerful. The current of this tube should shake an entrance 300B (capacitor loading).> Yes, I run my 300B at 60mA.
The current in norm, but voltage is not enough. The lamp should be more heated up. Probably you need to lift a voltage up to 380 volt (plate-cathode TJ300B).
"Whether you are ready to go on the big expenses?
It is important to be determined with components. They should be the best quality, that is correspond F5002. Condensers should be BG WKZ. Displacement of tubes should be fixed."Expenses is not my problem. However, I really hate the bad charge&recharge habit of Blackgate. Do you have others highend caps to recommended?
"Intercascade transformer Tamura SS-351." .What is it???
"Probably you need to lift a voltage up to 380 volt (plate-cathode TJ300B)."
You means that I have to lift the voltage accross the 300B to be 380V, so if voltage drop at cathode is 70V the voltage at plate would be 70+380=450V, right?
> Expenses is not my problem. However, I really hate the bad > charge&recharge habit of Blackgate. Do you have others highend caps > to recommended?
Charge&recharge for these capacitors is secondary. More important, they bring what distortions in a path of signal. Because they stand in a way of signal.There is such concept - an objective reality.
And it in a case with capacitors is such: objectively capacitors BG WKZ sound most better.
And only BG WKZ unique from electrolitic capacitors are at level F5002.
Till 2000 old capacitors ELNA CERAFINE were quite good, but then their manufacture modernized. By the way, during same time with transformers TANGO...> You means that I have to lift the voltage accross the 300B to be > 380V, so if voltage drop at cathode is 70V the voltage at plate would > be 70+380=450V, right?
Yes, you have correctly understood. And it is even better to make the fixed displacement, having removed from cathode TJ300B the resistor with capacitor. Then you should not change a voltage of a output stage.
> What is it???This is interstage transformer from Tamura.
Vl
Right now I used, Blackgate NH 68uf to supply the 6SN7 like you suggested and the Reference EURO oil caps from RAM to for 300B power supply.Sound a lot better.
Do you think I still need WKZ to replace Reference Euro oil cap??? Does it gona improve the sound???
There is very good oil capacitor Jenson. Its best use as interstage (only!) the capacitor. Better it for interstage there are only transformers.
I do not know such capacitors.
The only thing - speaks my experience, that it is the big-big commerce.BG WKZ remain outside of competition as capacitors for short a sound current.
The note: never shunt the basic big capacitors small!
And to decide already to you. What value of the capacitor stands in your amplifier on a tube 300B?
"What value of the capacitor stands in your amplifier on a tube 300B?"I use 22mf Ref Euro Oil as input cap -> 5H Tamura A-4005 choke -> two 22mf Ref Euro oil to supply 300B -> 68 Blackgate NH for 6SN7.
In this case, I believe that u suggest me to have BG WKZ instate of two 22mf Ref Euro for the socond B+ cap, right? What the value u think it is appropriate ?
Hmmm... there is one more problem, My power transformer is 400V-0-400V, so the voltage at the second B+ cap is around 480-490V. Do you think the WKZ 500V can stand that??? Coz my experience tell me not to use voltage exceed the 80% of WKZ.
PS. I have planty of Blackgate cap N, NH, WKZ, standard. But the WKZ I have right now is rate only 350V.
In your case I would make thus.
The first capacitor from rectifier 22mF oil - choke -100mF BG WRZ.
80 % from value of voltage could be applied earlier, for a long time, in connection with unreliability electrolitic capacitors and jumps of voltage in a power line.
Now capacitors take into account possible time an overvoltage, especially such brands, as manufacturer BG.
If at you a maximum 490V, I would not began to be afraid and have put BG 500V.
Besides if at you the having transformer will allow to put additional loading, I would recommend to put the shunt on 20 - 30 mA. It will reduce voltage by ten volt. But at you not the big value choke, unfortunately.
Thank U so much. I will try.
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