Because that the time delay circuit quit simple is. Has every change of value and components influence on the time or function.
By adjusting R/C value you can change start-up delay and with another transistor(gain) you can drive relais with a higher coil current. Try to get about 20 seconds delay, in thar time the tubes are hot enough and output voltage is stable.
By adjusting R/C value you can change start-up delay and with another transistor(gain) you can drive relais with a higher coil current. Try to get about 20 seconds delay, in thar time the tubes are hot enough and output voltage is stable.
Yes, this particular SMPS should be avoided at all cost. When I replaced it with a linear supply, Koifarm's preamp sings beautifully!
With a difference of just a view resistors build and listen to both and tell us which you like most.
Mu-follower has much better psrr then SRPP. Mu-follower can drive lower impedance with same distortion then SRPP.
And there is a difference in harmonics signature. Therefore you must listen which you like best or maybe you dont hear any difference.
Ad simple LCLC filter in DC output to smps and you dont hear any artifacts.
Mu-follower has much better psrr then SRPP. Mu-follower can drive lower impedance with same distortion then SRPP.
And there is a difference in harmonics signature. Therefore you must listen which you like best or maybe you dont hear any difference.
Ad simple LCLC filter in DC output to smps and you dont hear any artifacts.
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Yours plays better than this
https://www.musicdirect.com/equipment/amplification/preamp/icon-audio-la5-tx-tube-preamp/
https://www.musicdirect.com/equipment/amplification/preamp/icon-audio-la5-tx-tube-preamp/
How is the tube amp working and sounding with 6DJ8 tube? What changes did you made in this schematic to use with 6DJ8 tube? What B+ voltage are you using?
(Partially genuine Googgle translate, from France 
)
Hello everyone, hello Koifarm (fantastic project). I land late on this thread, and I'm a bit of a noob. I'm thinking of assembling this preamp in not too long - I'm currently on the NuTube B1 from Nelson Pass. ... And since I have Russian tubes to use (6N6P or 6H6P ? memory)... Some newbie's questions:
Friendly,
Geofdk
)Hello everyone, hello Koifarm (fantastic project). I land late on this thread, and I'm a bit of a noob. I'm thinking of assembling this preamp in not too long - I'm currently on the NuTube B1 from Nelson Pass. ... And since I have Russian tubes to use (6N6P or 6H6P ? memory)... Some newbie's questions
: - The PCB with the 2 tubes is stereo, and not mono? It does not take 2 pcb and 4 tubes for stereo ?
- Does anyone have a PCB to dispatch? I am very interested! (otherwise I order, JLPCB I think, maybe in one month)
Friendly,
Geofdk
It is stereo as you can see in the first post and I have a (red) stereo board for you. Please send me a PM.
BTW you likely won't experience nasties with linear PSUs as these only need to filter 50Hz mainly and don't create HF/RF by themselves. Choosing SMPS in audio simply is gambling.
BTW you likely won't experience nasties with linear PSUs as these only need to filter 50Hz mainly and don't create HF/RF by themselves. Choosing SMPS in audio simply is gambling.
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