finished my PCC88 preamp

Roemhild · 16th June 2006, 07:46 AM

Hi @ll

I just have finished my PCC88 preamp. I have build it together with an Class-A-amp.

Roemhild · 16th June 2006, 07:48 AM

pic. 2

Roemhild · 16th June 2006, 07:50 AM

pic. 3

Tyimo · 5th November 2006, 11:17 AM

Hi Till!

How do you like the sound???
What is the power stage circuit??? Maybe a schematic for the public??

Greets:

Tyimo

ilimzn · 5th November 2006, 03:10 PM

Not entirely on topic

but where did you get the heatsinks?

Roemhild · 6th November 2006, 08:45 AM

Quote:

Originally posted by Tyimo
Hi Till!

How do you like the sound???
What is the power stage circuit??? Maybe a schematic for the public??

Greets:

Tyimo

Hi Tyimo,

the sound is really good. It is a very good addition to a class-A amp like the Pass Aleph.

What do you mean with the power stage circuit? Do you mean the amp? This is similar to the Aleph.

greets Till

Quote:

Originally posted by ilimzn
Not entirely on topic but where did you get the heatsinks?

Hi ilimzn,

the heatsinks are out of an old car-hifi-amp that I have had in the early 90s. The amp was realy bad so I stripped it and kept the heatsinks.
But you can get them here:

http://www.seifert-electronic.de

greets Till

Nordic · 6th November 2006, 09:05 AM

Excuse the ignorance, is it similar to ECC88?
If so are you using anything to amplify the voltage a bit before the output stage? I love the "sound" of the ECC88, the implementation I have running now, is not coloured, although I'd admit it is slightly veiled in the midrange.

But what keeps eating me is that it basicaly runs at less than unity voltage gain, which probbly means the next stage is working even harder... also current output is pretty low

Sounds freakin nice though, not using it in the absence of anything better is not an option. One of my the locals I met through this site is peaking my interest in improveing/replaceing my valve buffer.

The only benifit I can see it is the nice input impendance... hard to imagine it has such a big effect though.

Roemhild · 6th November 2006, 10:56 AM

Hi Nordic,

the difference between the PCC88 and the ECC88 is that the PCC88 needs 300mA for the heating, the ECC88 needs 6.3V (or so).

Right now I am using the PCC189. It is based on the PCC88 and you dont have to change anything. Just Plug and Play. The sound is a bit "smoother" and "realistic" now. It sounds better for my ears.

I don´t know if there is a difference or benifit to an other preamp. I have only got a comparison to some other preamps with normal transistors. sorry for that

greets Till

Nordic · 6th November 2006, 11:04 AM

Yep, sounds like they are similar... running 6V at 365mA on the heaters over here...

I only use one half of a valve to get my 2 channels, your implimentation seems to add more current by using both halves

I have 2 spare ECC88s, think I'll try your circuit as soon as I have cashflow for a small transformer again...think I used up all of mine now... and a few PSU caps.

Are the heatsinks just for show?

Roemhild · 6th November 2006, 11:20 AM

Quote:

Originally posted by Nordic

(...)

Are the heatsinks just for show?

Hi again,

no the heatsinks are for a Class-A amp. This is a combination of the amp and the preeamp. It has a seperate housing for the current supply.

The combo has only one input. Nothing in it that I dont need.

greets Till

6th November 2006, 10:56 AM	#8
Roemhild diyAudio Member Join Date: May 2005 Location: Stuttgart / Germany	Hi Nordic, the difference between the PCC88 and the ECC88 is that the PCC88 needs 300mA for the heating, the ECC88 needs 6.3V (or so). Right now I am using the PCC189. It is based on the PCC88 and you dont have to change anything. Just Plug and Play. The sound is a bit "smoother" and "realistic" now. It sounds better for my ears. I don´t know if there is a difference or benifit to an other preamp. I have only got a comparison to some other preamps with normal transistors. sorry for that greets Till __________________ http://www.hornlautsprecher.de

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5th November 2006, 11:17 AM	#4
Tyimo diyAudio Member Join Date: Nov 2002 Location: Hungary	Hi Till! How do you like the sound??? What is the power stage circuit??? Maybe a schematic for the public?? Greets: Tyimo

5th November 2006, 03:10 PM	#5
ilimzn diyAudio Member Join Date: Feb 2005 Location: Zagreb	Not entirely on topic but where did you get the heatsinks?

6th November 2006, 09:05 AM	#7
Nordic diyAudio Member Join Date: Sep 2005	Excuse the ignorance, is it similar to ECC88? If so are you using anything to amplify the voltage a bit before the output stage? I love the "sound" of the ECC88, the implementation I have running now, is not coloured, although I'd admit it is slightly veiled in the midrange. But what keeps eating me is that it basicaly runs at less than unity voltage gain, which probbly means the next stage is working even harder... also current output is pretty low Sounds freakin nice though, not using it in the absence of anything better is not an option. One of my the locals I met through this site is peaking my interest in improveing/replaceing my valve buffer. The only benifit I can see it is the nice input impendance... hard to imagine it has such a big effect though.

6th November 2006, 11:04 AM	#9
Nordic diyAudio Member Join Date: Sep 2005	Yep, sounds like they are similar... running 6V at 365mA on the heaters over here... I only use one half of a valve to get my 2 channels, your implimentation seems to add more current by using both halves I have 2 spare ECC88s, think I'll try your circuit as soon as I have cashflow for a small transformer again...think I used up all of mine now... and a few PSU caps. Are the heatsinks just for show?

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