Thinking of building a 10/10y linestage wondering what the rest of you have done. Seen josh's but like to stay away from all the iron.
I am open to a good low mu power tube design guess I am just Fishin for ideas!!
😀
I am open to a good low mu power tube design guess I am just Fishin for ideas!!
😀
The 10/10Y are great
But I prefer the #26 over the 10 in preamp. (I swing 1.6V output for clipping my amp)
I also try the 801,417A,c3m,6j5gt,6922(not a joke) and the #26 beat them all.
Don`t forget to battery bias!
I have to specify that my amplifier contain 10, 801 and 845,
I using all DHT exept in my DAC and my RIAA preamp (I may change that some day)
Regards
But I prefer the #26 over the 10 in preamp. (I swing 1.6V output for clipping my amp)
I also try the 801,417A,c3m,6j5gt,6922(not a joke) and the #26 beat them all.
Don`t forget to battery bias!
I have to specify that my amplifier contain 10, 801 and 845,
I using all DHT exept in my DAC and my RIAA preamp (I may change that some day)
Regards
Hi etalon90,
My friend and I is planning to build the 26 tube line amp. Do you mind let us know what kind of power supply for the 26 filament of your line amp? Also, is it a RC loaded or choke loaded?
Thank you,
Johnny
My friend and I is planning to build the 26 tube line amp. Do you mind let us know what kind of power supply for the 26 filament of your line amp? Also, is it a RC loaded or choke loaded?
Thank you,
Johnny
Kmtang,
The #26 heater is usualy hard to deal, You must have perfect DC.
I use a switching power supply designed for computer computer use. At my local surplut, I pay $4.99 CAD each!
It deliver 12V@1.75A.
This psu feed an LCRC circuit to provide a 100% clean 1.5V.
(even without filter circuit, on my scope, the voltage is very clean, I guest that an RC only will do as good)
And I use an isolation transformer on the main because I don`t want the switching psu to put some noise on the main.
It sound very good. I didn`t compare to battery but I didn`t find much difference between Current regulation. (even my heater psu is a bit better and less expensive)
The #26 heater is usualy hard to deal, You must have perfect DC.
I use a switching power supply designed for computer computer use. At my local surplut, I pay $4.99 CAD each!
It deliver 12V@1.75A.
This psu feed an LCRC circuit to provide a 100% clean 1.5V.
(even without filter circuit, on my scope, the voltage is very clean, I guest that an RC only will do as good)
And I use an isolation transformer on the main because I don`t want the switching psu to put some noise on the main.
It sound very good. I didn`t compare to battery but I didn`t find much difference between Current regulation. (even my heater psu is a bit better and less expensive)
etalon90 said:Kmtang,
The #26 heater is usualy hard to deal, You must have perfect DC.
I use a switching power supply designed for computer computer use. At my local surplut, I pay $4.99 CAD each!
It deliver 12V@1.75A.
This psu feed an LCRC circuit to provide a 100% clean 1.5V.
(even without filter circuit, on my scope, the voltage is very clean, I guest that an RC only will do as good)
And I use an isolation transformer on the main because I don`t want the switching psu to put some noise on the main.
It sound very good. I didn`t compare to battery but I didn`t find much difference between Current regulation. (even my heater psu is a bit better and less expensive)
etalon90,
Very good idea as i have had this noise problem with the 27 also, mostly the old mesh plate glodes maybe with this supply i can get better than 1 in 5 is usable in a line stage.
Thanks Tony
HI DAY,
Very nice job!
you don`t use capacitor bypass?
You may try battery bias, It will possibly perform better that resistor only (with better gain ans lower Zout)
And, what is your transformer ratio?
Martin
Very nice job!
you don`t use capacitor bypass?
You may try battery bias, It will possibly perform better that resistor only (with better gain ans lower Zout)
And, what is your transformer ratio?
Martin
hi Martin
i have 47uf 50v capacitor bypass
interstage ratio is 10k:600 ohm
do you have a circuit for battery bias for me
thank you
DAY
i have 47uf 50v capacitor bypass
interstage ratio is 10k:600 ohm
do you have a circuit for battery bias for me
thank you
DAY
The 10 tube's filament supply is 7.5V 1.25A. You probably need two 12V car batteries and DC regulator to get it down to 7.5V.
I think it is just impractical having two big batteries next to the line amp. Also, you need to recharge them everytime after use.
If you use regulated DC supply for the filament, it should not cause too much of hum. The hum probably from either B+ or induced from the magnetic leakage of the power transformer and choke. It's much better to have a separate power supply for the line amp.
Johnny
I think it is just impractical having two big batteries next to the line amp. Also, you need to recharge them everytime after use.
If you use regulated DC supply for the filament, it should not cause too much of hum. The hum probably from either B+ or induced from the magnetic leakage of the power transformer and choke. It's much better to have a separate power supply for the line amp.
Johnny
you say right . i put some shoke near the tube . hum may come form it. now i use DC bias i put 30000uf of cap . how many cap shall i use.
DAY
DAY
Hi Day,
Are you using IC regulator for the filament circuit? If not, you need to be very careful on the filament voltage. Probably you need to put an RC filter for the filament for limit the voltage to the correct value and it will provide better filtering for the filament.
Johnny
Are you using IC regulator for the filament circuit? If not, you need to be very careful on the filament voltage. Probably you need to put an RC filter for the filament for limit the voltage to the correct value and it will provide better filtering for the filament.
Johnny
you may also purposely run the filament at 6V, and just use one battery.
http://www.tubecad.com/july2000/page10.html
Furthermore, use one of those LM*** thingy to run as current source.
http://www.vt52.com/diy/myprojects/amps/exodus/exodus.htm
http://www.tubecad.com/july2000/page10.html
Furthermore, use one of those LM*** thingy to run as current source.
http://www.vt52.com/diy/myprojects/amps/exodus/exodus.htm
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