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Old 29th April 2014, 06:26 PM   #6131
PloPla is offline PloPla  Italy
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Join Date: Oct 2004
Quote:
Originally Posted by skippyboy View Post
Hi,
Whats the idea with the copper tube and elbow.
It should be a shield. Not for mains cables but for signal input cables.
I don't have any metal part in the case and the amp is placed in a bookcase with tons of electronical equipments around. In ls than two meters:
- TV
- Children's PlayStation
- Children's Xbox
- Children's Wii
- Cordless phone
- Router
- Multimedia HT-PC
- DAC
- Blueray reader/writer

not all switched on at the same time but enough to make some noise.
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Old 29th April 2014, 06:32 PM   #6132
PloPla is offline PloPla  Italy
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Quote:
Originally Posted by JAMESBOS View Post
Must have cost a bomb!
Not cheap, but....I collected components in the last two years founding some bargains.
I went to Tokyo some monts ago and I get the Tamura I had'nt.

I should check but sure no more than 4.000 euros. Including all parts. Don't tell it to my wife.
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Old 29th April 2014, 06:50 PM   #6133
PloPla is offline PloPla  Italy
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Quote:
Originally Posted by felixx View Post
PloPla.....great work.Congrats.
Why did not use all the iron from Tribute?...or Tamura?
Diagrams to share??
Thanks.
What speakers did you drive with this?
I have a couple of Tamura B-5003, but the Tribute.....
Speaking around seems a miracle to have been able to receive a couple of Tribute in a relatively short time.
I'll ask him for some more for shure, excellent products, but I know you have to wait.

I don't have a diagram.
But is not a difficult.
- Double choke supply in common mode (half each on the positive side, half on the negative).
- 5u-10mH-70u-10mH-210u-R-70u
- A blue led under the c3g to get -2.8V on the grid
- A power zener 68V under the 300B
- B+ 390 (including the 68 on the grid)->65mA
- B++ 200V
- Interstage
- grid stopper 1k
- grid resistors 100k on both tubes
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Old 29th April 2014, 08:39 PM   #6134
Unison845 is offline Unison845  United States
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Join Date: Apr 2004
Location: California
Default C3G/300B

Yes, that was C3G driving 845. I took the shield cover off exposing the tube, I call it C3GS nude.

Below is 300B PSE amplifier. Input tube is also C3G painted. Amplifier has tube regulated power supply and oil cap. Originally it was a 3 stage SE 300B with interstage, C3G input driver 300B with interstage driving a SE 300B. It has been changed to 2 stage 15W PSE300B, but it can also be modified to 8W SE 300B without much work. Output transforner is James.

Quote:
Originally Posted by dady View Post
Fantastic look.
The tube I thank is a WE437 but is a C3G without shield.
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Old 29th April 2014, 08:56 PM   #6135
PloPla is offline PloPla  Italy
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A painted c3g is a crazy idea.

I like it.

Maybe maybe....
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Old 29th April 2014, 10:26 PM   #6136
PloPla is offline PloPla  Italy
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This was the beginning.
Yes I took it from far.
You can se a report of the building process at
www.audiofaidate.org • View topic - Ampli 300b (ancora) - 6) La costruzione
Italian only, sorry.
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Old 30th April 2014, 12:30 PM   #6137
felixx is offline felixx  Romania
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Yes,I talk with Pieter from Tribute many times and I know his work ...very good indeed....and core used is outstanding.
Still.....what type of speakers do you have for this amplifier?
Thanks.
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Old 30th April 2014, 01:00 PM   #6138
TonyTecson is offline TonyTecson  Philippines
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Location: Maybunga, Pasig City
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This is the Audioromy FU29 pp amp, the main issue with this amp
is "red plating" since cathode is common to both sections,
the only way to balance currents in both plates is thru fixed bias....
(actually there are two other mods that can be done, one is by manipulating
the filament voltage, and the other by tweaking the screen grid voltage
from its set point of about 200 volts....i am looking to implement these
in my upcoming 829b builds)

Click the image to open in full size.

in order to fix the issue, i changed bias to cathode resistor bias instead...

Click the image to open in full size.

a 270 ohm 5 watt resistor drops 17 volts, so that at idle, total
plate dissipation for both tubes is about 26 watts, so that either
plate is dissipating about 13 watts...remember that this tube can dissipate 60 watts...
so that longer life expectancy for the 829b is more or less secured.... 8)

before mods..
Click the image to open in full size.

after mods..
Click the image to open in full size.

other mods included changing plate caps to ceramic type...

Click the image to open in full size.

the nylon type used was actually a solderless connector...
Click the image to open in full size.
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Old 30th April 2014, 02:12 PM   #6139
PloPla is offline PloPla  Italy
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Quote:
Originally Posted by felixx View Post
Yes,I talk with Pieter from Tribute many times and I know his work ...very good indeed....and core used is outstanding.
Still.....what type of speakers do you have for this amplifier?
Thanks.
Ooops, sorry, I forgot to answer to your question.

JBL 15" 2226H in BR 90 liters + B&C 2" driver DCM50 with StereoLab horns Tractrix 250 + Fostex T925
Filters round 500Hz and 5.000Hz
Efficency round 96 db/W
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Old 30th April 2014, 02:18 PM   #6140
PloPla is offline PloPla  Italy
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Wow....I had a look at your Picasa gallery.
Amazing loudspeakers.
I'm a fan of woodworking, more than electronik. I'll pick some good ideas from it if allowed.
Loudspekers made out of plywood layers e.g.
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