Lets build Ferrari..!
Let the IPS get the best. I agree but I have seen significant differences when IPS device is changed. From BJTs of various types to Fets to Jfets. Everything will have very unique signature.
Let the IPS get the best. I agree but I have seen significant differences when IPS device is changed. From BJTs of various types to Fets to Jfets. Everything will have very unique signature.
If you click on "Solid State" at the top of the page you will see a button called "New thread". We promise to follow your progress.
I like that piece of advice.
Are boards available for this 12AU7 IPS and can it be modified to use as a line stage?
Yes, the boards (V1.3) are available from jwilhelm and it can be easily used as a top quality line stage. Gain may be lowered as required - right now it's set to 29db.
Power rails are +/-50...52V DC.
I'll contact Jeff about the boards.
Which resistor(s) would need to be changed to lower the gain?
29dB would be too high for most sources.
Interesting that the tube would work with such a low plate voltage.
Which resistor(s) would need to be changed to lower the gain?
29dB would be too high for most sources.
Interesting that the tube would work with such a low plate voltage.
Is the Tube a 6DG8 or 6DJ8?
Could be used too the 6N1P(E/EV) in low voltage configuration successful?
Could be used too the 6N1P(E/EV) in low voltage configuration successful?
Is this tube IPS DC-coupled on the output with a servo?
That's the way it looks, though the schematic is difficult for me to read even when enlarged on a 32" monitor.
I'm sure Jeff can email me a more legible schematic.
Is there a BOM for this IPS somewhere?
That's the way it looks, though the schematic is difficult for me to read even when enlarged on a 32" monitor.
I'm sure Jeff can email me a more legible schematic.
Is there a BOM for this IPS somewhere?
Thx Terry and evan.
Terry i am right you have build and tested a IPS (Borys?) with ECC88 but forget the B+
what was used there.
Yes different pinout- but can a 6N1P deliver same stable current in low voltage use?- my only thought- i have any but only build a NISHIKI Amplifier with them- SRPP- 340V B+.
Terry i am right you have build and tested a IPS (Borys?) with ECC88 but forget the B+
what was used there.
Yes different pinout- but can a 6N1P deliver same stable current in low voltage use?- my only thought- i have any but only build a NISHIKI Amplifier with them- SRPP- 340V B+.
Hi Bangla,
Depends on particular design. TubSuMo is designed particularly for 12AU7.
TubeHex, for example, will work well with 6DJ8 and 6N1P:
http://www.diyaudio.com/forums/solid-state/294632-sons-vhex-8.html#post4818690
Cheers,
Valery
To be honest, I tried to get the 6n1p to work in a few different ECC88 circuits. I never really got it to be stable. Maybe it just needed some more tweaking but I don't know enough about tubes to be the one to do it. I did manage to get it to work in a tube linestage preamp that Apex designed but I'm not sure it was any better than the ECC88, only that it worked.
Thx Valery.
I follow thread Son of VHex- not sure of soldering work SMD with ERSA 25W Multitip.
Will keep proceed thread.
Terry that is sad, non success with this little beasts - but me too don't know enough, and learn slow.
Wiki tells about transconductance 6N1P- 4,35mA/V to 6DJ8- 12,5mA/V. Other point
is inner resistance- bit like JFet.
Many others could explain what that means for tweaking.
WIKI:
The 6N1P has similar ratings to the 6DJ8 and in the past was sometimes rebranded as such, however differences between the two types (the 6N1P requires half the filament current and has only one third the S value) mean they are not directly interchangeable. The S is about 4.35 ma/V, the 6DJ8/ECC88 has a S of 12.5 ma/V and a gain of 33 and a lower internal resistance. However, the 6N1P is typically more linear for a given load. It is therefore inaccurate to say that these two tubes are identical.
I follow thread Son of VHex- not sure of soldering work SMD with ERSA 25W Multitip.
Will keep proceed thread.
Terry that is sad, non success with this little beasts - but me too don't know enough, and learn slow.
Wiki tells about transconductance 6N1P- 4,35mA/V to 6DJ8- 12,5mA/V. Other point
is inner resistance- bit like JFet.
Many others could explain what that means for tweaking.
WIKI:
The 6N1P has similar ratings to the 6DJ8 and in the past was sometimes rebranded as such, however differences between the two types (the 6N1P requires half the filament current and has only one third the S value) mean they are not directly interchangeable. The S is about 4.35 ma/V, the 6DJ8/ECC88 has a S of 12.5 ma/V and a gain of 33 and a lower internal resistance. However, the 6N1P is typically more linear for a given load. It is therefore inaccurate to say that these two tubes are identical.
The only reason I was interested in makeing the 6n1p work was because someone had suggested it as a good tube for the amp so I bought some. The ECC88 and 6DJ8 both work perfectly so there is really no reason to change. Bory's VSHA ECC88 works beautifully with the Slewmaster OPS. So does his version with the 12AU7. This TubSuMo is a lovely amp. Very detailed yet warm with a big sound stage and good tight bass. No need to change the tube.
The 6N1P is often said to be a drop-in replacement for the 6DJ8/6922 but this really isn't true. If you look at the plate curves, these two tubes are not the same at all, and the differences are more pronounced at the low voltage/low current section of the curves. You might be able to use the 6N1P in some circuits designed for the 6DJ8, but that's not always the case. To use the 6N1P in this circuit, some component values would likely have to be changed.
The 6DJ8 (also labeled ECC88) was originally designed for what is known as a cascode configuration, with one triode section sitting on top of the other, and its triode sections may not be identical (depending on the manufacturer). The 6922 (also labeled E88CC) is a more rugged version of the same tube and its triode sections are the same, so it is a better choice for a differential configuration like the TubeSuMo. The 6922 is in current production and is easier to source than a "new old stock" (NOS) 6DJ8.
I hope this is helpful.
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Thx Terry and Ray,
very kind information too.
That many different information to keep in view, to read, to understand is not easy and the reason for me- any other too, why i learn slow as non electronic guy.
But it keeps the Brian on live to learn- i enjoy that hobby with all difficulties.
very kind information too.
That many different information to keep in view, to read, to understand is not easy and the reason for me- any other too, why i learn slow as non electronic guy.
But it keeps the Brian on live to learn- i enjoy that hobby with all difficulties.