Terry,
In the circuit where you're using the 6922 and ECC88 tubes try ECC189 or 6ES8.I'm testing a TLP with these tubes and the 6ES8 is the best sounding very relaxed but engaging and strong bass.I also can use the 6922 and ECC88 tubes
I order my tubes here
http://www.electrontubes.nl
In the circuit where you're using the 6922 and ECC88 tubes try ECC189 or 6ES8.I'm testing a TLP with these tubes and the 6ES8 is the best sounding very relaxed but engaging and strong bass.I also can use the 6922 and ECC88 tubes
I order my tubes here
http://www.electrontubes.nl
Hi are they direct (without part or part value change) swapable with ECC88? Because i was the "one" said in the thread said it for 6np1 and induced terry on wrong way just beacause you see in many place 6np1 are ECC88 equivalent.
Marc
Normaly my TLP uses the ECC189 or the 6ES8 but I've swapped them with 6922 and yes also no probs by using ECC88 no parts or value change needed.In my case that is I'm using them as cathode follower
There are many sources that claim the 6n1p is equivalent to ecc88/6dj8, including the manufacturer Svetlana. However, the closest western equivalent is actually 6bq7a. The issue with using the 6n1p in this circuit is the high Rp and low transconductance. You may be able to increase the plate currents for the tube and make them usable, but, the Rp will still be higher and transconductance will still be lower than any 6sn7,12au7,or 6dj8 at the same current.
Just saw this post. You do not need emitter followers to drive the MOSFETs. They have high enough input impedance that you can drive them directly from the plates of a 6SN7 at say 8mA. Of course via a cap. And you need bias resistors ala MOSCODE. Also: no need for the transistor in the bias circuit. I normally use a simple voltage splitter at 22K from each rail to a trimpot as the voltage splitter (cap 100uF or so across). If you want DC offset, then another 1K trimpot across that with a ground ref to the viper. Then tie the legs of the voltage splitter to 1M resistors to each gate (again as in MOSCODE 300). This allows you to use good quality film/foil caps in the .1uF/600V variety to couple AC to the tube.
D.
D.
Al tube sound spec 88 type sounds different by manufactory, Very good are Philips E88 special quality European, some of Russia 6922 6N1 many types and Tungsram.
many of 88 have bad microphono effect.
Have tested many of 88 and 6922 under many years now,Some od Siemens and Telefunken also relative good, try proven yourserfarebest,we hear different no only
doesent exist.
alec
many of 88 have bad microphono effect.
Have tested many of 88 and 6922 under many years now,Some od Siemens and Telefunken also relative good, try proven yourserfarebest,we hear different no only
doesent exist.
alec
You are right. The good old 6SN7 does a great job in many configurations. Right now, I am using this very tube to drive 2SK1058 in a Circlotron configuration. No cathode follewer and 10mA on the plates.😀
Hi Marc,
I answered incorrectly earlier. This is the schematic I used for your boards. Works beautifully. I will try to test it against the boards that I built on Peter's boards. I believe I used the other values in that one.
Hi Guys,
I asked in the tube forum for some help getting the 6N1P to work in this amp. There are three components that need to be changed. R6 becomes 4k7, R19 becomes 10k and D1 becomes a 15V zener. It works.
I asked in the tube forum for some help getting the 6N1P to work in this amp. There are three components that need to be changed. R6 becomes 4k7, R19 becomes 10k and D1 becomes a 15V zener. It works.
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Terry,
Do I see you installed a 5k (3296W 20 turn pot) for R9 and 1k for R10? is this needed too?
Matthew
Do I see you installed a 5k (3296W 20 turn pot) for R9 and 1k for R10? is this needed too?
Matthew
I think so. I will have to check all the schematics. I checked all my working boards and that is what was used.
Hi Matthew,
I have checked all the schematics I have and they all have 5k for R9 and 1K for R10. Those work for all three 12AU7, ECC88 and 6N1P.
One more thing folks need to know who may be just now following this thread now that they have boards to build is that you need some type of DC protection for the speakers since the offset will swing wildly on start up until the tube heats up. Ideally, it is best to start the tube heater first for about 10 seconds before turning on the rails. If that is done the offset will be < 2V. If both are started at the same time the offset can be as high as full rail for a few seconds.
I have checked all the schematics I have and they all have 5k for R9 and 1K for R10. Those work for all three 12AU7, ECC88 and 6N1P.
One more thing folks need to know who may be just now following this thread now that they have boards to build is that you need some type of DC protection for the speakers since the offset will swing wildly on start up until the tube heats up. Ideally, it is best to start the tube heater first for about 10 seconds before turning on the rails. If that is done the offset will be < 2V. If both are started at the same time the offset can be as high as full rail for a few seconds.
Hi Terry, thanks for sharing et give poeple an alternative to ecc88 hi coast. It will be interesting to have your allways objective opinion how 6N1P.
No issue with board layout?
Marc
Terry,
Using your schemat from post #391, what are the voltages:
1. Across R19 10K
2. Across R1 4k7 and R2 4k7.
3. Across R25 470R and R26 470
4. Across R29/R11 (total 11k for the two)
What sort of output stage are you using? A 2EF? Where is R9?
When you have these voltages, a full examination can be done.
Interesting in the sound quality. Good?
Cheers,
Hugh
Using your schemat from post #391, what are the voltages:
1. Across R19 10K
2. Across R1 4k7 and R2 4k7.
3. Across R25 470R and R26 470
4. Across R29/R11 (total 11k for the two)
What sort of output stage are you using? A 2EF? Where is R9?
When you have these voltages, a full examination can be done.
Interesting in the sound quality. Good?
Cheers,
Hugh
Hello!
The men and I want to see this miracle (amplifier). Please show because PCB bottom layout and PCB Top layout in pdf for the best version.
thanks!
The men and I want to see this miracle (amplifier). Please show because PCB bottom layout and PCB Top layout in pdf for the best version.
thanks!
R19, 10k =14v=1.4mA
R1, 4k7 = 3.58v=.76mA
R2, 4k7 = 3.90v=.82mA
R25, 470R = 3.5v=7.4mA
R26, 470R =.814=1.7mA
R29/11, 11k =102v=9.92mA
R24, 1K = 2.6v=2.6mA
For 1v at pin 3 R9 is set at 2k6
I don't have an OPS attached yet. Still testing the IPS. I have 100R resistors from PD+ and ND- to NFB. I'm getting .480v=4.8mA across each of those.
Blessings, Terry
Hold on and don't build this 6N1P circuit until I can do more testing. I suppose I should have built the ECC88 circuit first to verify the board layout. Right now I have no sine wave on the output. I will build one for the ECC88 to today so I can verify the boards first. If that tests OK I will come back to the 6N1P.
Stay tuned.
Stay tuned.