Valve Itch phono

[Salas]

Shibata

 

[merlin el mago]

After changed the resistors and added HF RIAA capacitor the sound has changed, before I used:

R2 Kiwame 2W
R3 Takman carbon film 1/4W
R8 Caddock MK-132V
R9 Kiwame 2W
R10 Kiwame 2W
R11 Kiwame 2W

Now I use:
R2 Mills 5W
R3 Mills 5W
R8 Amtrans 0.75W
R9 Mills 5W
R10 Mills 5W
R11 Mills 5W

Now with the 2 dBs more the phono pre is more powerful, it seems the sound with the Kiwame was more clear but also more edge, I don't know if the difference is only the resistors because as you know I added the HC capacitance, now the sound is more round & warm & a lot of more dense like if was more information or harmonics, also is more punch.

What do you think?

 

[merlin el mago]

Shibata

4 times greater contact than elliptical

 

[Salas]

After changed the resistors and added HF RIAA capacitor the sound has changed, before I used:

R2 Kiwame 2W
R3 Takman carbon film 1/4W
R8 Caddock MK-132V
R9 Kiwame 2W
R10 Kiwame 2W
R11 Kiwame 2W

Now I use:
R2 Mills 5W
R3 Mills 5W
R8 Amtrans 0.75W
R9 Mills 5W
R10 Mills 5W
R11 Mills 5W

Now with the 2 dBs more the phono pre is more powerful, it seems the sound with the Kiwame was more clear but also more edge, I don't know if the difference is only the resistors because as you know I added the HC capacitance, now the sound is more round & warm & a lot of more dense like if was more information or harmonics, also is more punch.

What do you think?

Seems to me more like a Shure sound. But if you will feel like exploring sure golden compromise see with tedious HF little capacitance manipulation too.

 

[merlin el mago]

There is also the maximum capacitance load of 400-500pF

I have actually 220pF Ekos cable + 60-70pF input capacitance of Itch = 290pF maximum, still margin to play with the input capacitance load.

What do you try first Salas the input capacitance or the RIAA HF capacitance?

 

[Salas]

Hmm... the input capacitance first. So to hear the effect of what maximum load capacitance does and judge if productive to go tweaking the RIAA HF

 

[merlin el mago]

I think I left more burn in the new resistors & capacitors before touching the input capacitance or RIAA HF capacitor.

 

[merlin el mago]

Salas could I change R9 330R for 1 or 2 red LEDs?

 

[Salas]

One green, but its not better for noise or in following tube aging bias

 

[merlin el mago]

Could I use 1/2W in that position, right?

 

[Salas]

R9 is not dissipating significantly (12mW) so you can put any kind of wattage for resistor type you fancy and/or you may have in hand.

 

[merlin el mago]

Shinkoh!!!!!

 

[merlin el mago]

What 330R have more impact in the SQ R9 or R11?

 

[Salas]

Both are doing the same thing equally on top and bottom sections which are one stage combined

 

[merlin el mago]

Salas for R5 I'm using 49k9 1% I guess isn't necessary add the 100R more?

 

[Salas]

I don't think really audible. Better not an extra part in the signal.

 

[merlin el mago]

I asked because is RIAA part.

 

[merlin el mago]

Today I played with VTA to be sure doesn't affect the SQ.

 

[merlin el mago]

Both are doing the same thing equally on top and bottom sections which are one stage combined

I have only 2 Shinkoh

 

[Salas]

Check them for each channel's R9 in that case. Nearer positions to where the signal goes in.