Hello
In attach the photo of the phono stage with LCR de-enphasis
With two active stage with tube loaded with a 5:1 trafos.
LiberTango ( song from Piazzolla) because is free from Tango transformer that are now almost difficult to find.
The full configuration is:
step-up, first stage with Sowter NI custom trafo 5:1, LCR by Eltra in Turin (Italy) , 600:15Kohm intestage (Eltra), second stage with Sowter Ni.
Then a separate box for power, two indipendent channel, Gz32 as rectifier and the possibility to use C-L (20H) -C filter or ss stabilized that I absolutely prefer
In total are 14 irons
Good results on test and listen.
This after a long run with prototypes done with full Tango irons and EC8020 stuff, same circuit topology, same electrical results ( with little differences)
LiberTango
This was the Tango proto
Walter
In attach the photo of the phono stage with LCR de-enphasis
With two active stage with tube loaded with a 5:1 trafos.
LiberTango ( song from Piazzolla) because is free from Tango transformer that are now almost difficult to find.
The full configuration is:
step-up, first stage with Sowter NI custom trafo 5:1, LCR by Eltra in Turin (Italy) , 600:15Kohm intestage (Eltra), second stage with Sowter Ni.
Then a separate box for power, two indipendent channel, Gz32 as rectifier and the possibility to use C-L (20H) -C filter or ss stabilized that I absolutely prefer
In total are 14 irons
Good results on test and listen.
This after a long run with prototypes done with full Tango irons and EC8020 stuff, same circuit topology, same electrical results ( with little differences)
LiberTango
This was the Tango proto
Walter
The full project was presented in two parts on Audioreview magazine in Italy.
The idea was to set an hardware with the same concept of original circuit with full Tango trafos.
But using other iron and, mainly, othe tubes.
The EC8020, that I know well and consider one of the bet tube ever, is scarce and very expensive.
So one solution, for me is the following schematic
Where the tubes are PC900 that I found at around 1-5 euros each.
I bought around 120 pcs / 100 euros just to understand the quality; are Toshiba .
The selection was not so difficult to get pairs with equals specs.
The gain is good, in this circuit is around 65-68 .
And the Rp and Gm are reasonable .
The iron was Sowter 1160 in NI version, custom order, not cheaper
The SUT is ELTRA Turin, Italy 1:12 and 24 ratio.
The coils are also ELTRA with specs very close to original Tango.
The T2 is ELTRA 600:15 kohm mumetal
The total gain was around 34 dB
The test are fine and the sound good ( opinions of gold ear friends)
Thi is a sofisticated method to put the nucleus in the right position
Thiis is the internal of active part ( without step up due the sonic tests)
+
This is the power
I use a tube rectifier then the ss stabilized , the reason is the rstio s/n that is very good, arund 80 dB
+
Walter
The idea was to set an hardware with the same concept of original circuit with full Tango trafos.
But using other iron and, mainly, othe tubes.
The EC8020, that I know well and consider one of the bet tube ever, is scarce and very expensive.
So one solution, for me is the following schematic
Where the tubes are PC900 that I found at around 1-5 euros each.
I bought around 120 pcs / 100 euros just to understand the quality; are Toshiba .
The selection was not so difficult to get pairs with equals specs.
The gain is good, in this circuit is around 65-68 .
And the Rp and Gm are reasonable .
The iron was Sowter 1160 in NI version, custom order, not cheaper
The SUT is ELTRA Turin, Italy 1:12 and 24 ratio.
The coils are also ELTRA with specs very close to original Tango.
The T2 is ELTRA 600:15 kohm mumetal
The total gain was around 34 dB
The test are fine and the sound good ( opinions of gold ear friends)
Thi is a sofisticated method to put the nucleus in the right position
Thiis is the internal of active part ( without step up due the sonic tests)
This is the power
I use a tube rectifier then the ss stabilized , the reason is the rstio s/n that is very good, arund 80 dB
Walter
Regarding the test lab are good and comparable with the similar full Tango circuit
The sonic results are also very fine
And this using a tube that cost 1 euro each
( I bought 100 pcs )
The PCC900 / 4HA5 now is easy to find between 1 to 5 euros each
nos and nib
And the selection is not so complicated
Walter
The sonic results are also very fine
And this using a tube that cost 1 euro each
( I bought 100 pcs )
The PCC900 / 4HA5 now is easy to find between 1 to 5 euros each
nos and nib
And the selection is not so complicated
Walter