Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Photo Gallery
Photo Gallery
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 13th October 2018, 06:45 PM   #8471
djmilicic is offline djmilicic
diyAudio Member
 
Join Date: Mar 2012
Default 6S4S (6С4С) with EF86 (6Ж32П)

HV stage is with 5C3S (5Ц3С) and two chokes and 4 capacitors (20uF motor run - 10H - 100uF/450V Siemens - 10H - 2x100uF/450V Siemens). The heater of rectifier has 30 seconds delay on. Output valves have DC heating with lm350 with slow start of 7 seconds. All transformers (5) and chokes (2) are DIY.
Attached Images
File Type: jpg opt1.jpg (774.7 KB, 884 views)
File Type: jpg spulna_otp_01.jpg (807.9 KB, 866 views)
File Type: jpg IMG_20180922_174518.jpg (421.7 KB, 832 views)
File Type: jpg IMG_20180917_195354.jpg (833.9 KB, 840 views)
File Type: jpg INSIDE_01.jpg (548.6 KB, 834 views)
  Reply With Quote
Old 14th October 2018, 05:05 PM   #8472
cbueche is offline cbueche  Switzerland
diyAudio Member
 
Join Date: Jun 2016
Location: PrÍles, Switzerland
Pete Millett Engineer Amp. Details in the thread.
Attached Images
File Type: jpg pmillet_engineer_top.jpg (80.4 KB, 872 views)
File Type: jpg pmillet_engineer_inside.jpg (175.8 KB, 842 views)

Last edited by cbueche; 14th October 2018 at 05:08 PM.
  Reply With Quote
Old 16th October 2018, 03:36 PM   #8473
AVWERK is offline AVWERK  United States
diyAudio Member
 
AVWERK's Avatar
 
Join Date: Jan 2004
Location: So Calif.
Nice and clean ! No long and messy wiring .
Good job Cb..


Regards
David
  Reply With Quote
Old 16th October 2018, 07:28 PM   #8474
JoeAlders is offline JoeAlders  Netherlands
diyAudio Member
 
Join Date: Feb 2011
Well, looking at the 5th picture of djmilicic, despite not being a pcb, I personally find this also nice and clean wiring!
  Reply With Quote
Old 17th October 2018, 10:23 PM   #8475
alex mm is offline alex mm  Romania
diyAudio Member
 
alex mm's Avatar
 
Join Date: Mar 2006
Location: Baia Mare ,
PP amplifier EL 34, schematic LMO and PCB by alex mm Work in progress .Power supply and delay (green PCB)
BR
Alex
Attached Images
File Type: jpg IMG_20181017_212716-001.jpg (830.5 KB, 218 views)
File Type: jpg IMG_20181017_212811-001.jpg (600.8 KB, 208 views)
File Type: jpg IMG_20181017_213124-001.jpg (1,010.6 KB, 211 views)
File Type: jpg IMG_20181017_215233-001.jpg (983.0 KB, 177 views)
File Type: jpg PP EL34 LMO.jpg (116.7 KB, 139 views)
__________________
CD player Onkyo C-N 7050 , Preamp's :Adagio tube
and Goldmund Mimesis 27 , Speakers :Taga Harmony Platinum F-120 Amp's: 2XGoldmund Mimesis9.2, A33, 2XGROMES A260 tube , SARA , QUAD 405-13

Last edited by alex mm; 17th October 2018 at 10:26 PM.
  Reply With Quote
Old 20th October 2018, 01:33 PM   #8476
Felix A is offline Felix A  Canada
diyAudio Member
 
Join Date: Jan 2014
This is a EL84 with a 12AU7 driver, deliver clean and nice sound, most from used parts lying around in the garage, mix and match is not always perfect, but a finished project out of the garage is always satisfying.
Attached Images
File Type: jpg IMG_1440.JPG (700.0 KB, 191 views)
File Type: jpg IMG_1436.JPG (654.4 KB, 177 views)
File Type: jpg IMG_1408.JPG (916.9 KB, 196 views)
  Reply With Quote
Old 20th October 2018, 01:39 PM   #8477
cbueche is offline cbueche  Switzerland
diyAudio Member
 
Join Date: Jun 2016
Location: PrÍles, Switzerland
Quote:
Originally Posted by Felix A View Post
This is a EL84 with a 12AU7 driver, deliver clean and nice sound, most from used parts lying around in the garage, mix and match is not always perfect, but a finished project out of the garage is always satisfying.

splendid wood work Felix ! Did you hide the OPTs in the box ?
  Reply With Quote
Old 20th October 2018, 04:44 PM   #8478
jamesfeline is offline jamesfeline  United Kingdom
diyAudio Member
 
jamesfeline's Avatar
 
Join Date: Feb 2006
Location: Essex
Quote:
Originally Posted by cbueche View Post
Pete Millett Engineer Amp.
very nice indeed .. well done, and the sound ? are you pleased
  Reply With Quote
Old 20th October 2018, 05:03 PM   #8479
cbueche is offline cbueche  Switzerland
diyAudio Member
 
Join Date: Jun 2016
Location: PrÍles, Switzerland
Quote:
Originally Posted by jamesfeline View Post
very nice indeed .. well done, and the sound ? are you pleased
The sound was excellent on the bench. Now that it's in the box, I have 3 issues:
  • mechanical hum from power-transformer. I tried a DC-blocker, not better. I think it's a bit overloaded with my 230V. Will try to use DC for heater, at least to confirm that a reduced load would help.
  • 50 Hz hum, even with shorted inputs. I'm not sure how to cable the input coax cables in regards to audio ground. Currently only the internal cables red+black are used between PCB and RCA input sockets, I will try to connect the coax shield to the audio ground on the PCB side.
  • intermittent "sound crashes" in the right channel. Need to swap tubes, I guess one is dying.
But to your original question, it sounded nice before casing, now need to fix the above issues and move it to living room on my Magnat speakers.
  Reply With Quote
Old 20th October 2018, 05:24 PM   #8480
jamesfeline is offline jamesfeline  United Kingdom
diyAudio Member
 
jamesfeline's Avatar
 
Join Date: Feb 2006
Location: Essex
Hello .. thanks for the quick reply

For the power transformers I normally use anti vibration mounts (threaded rubber spacers) also try and make the chassis top plate as thick as possible .. just some thoughts but well done great build
  Reply With Quote

Reply


Photo GalleryHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


New To Site? Need Help?

All times are GMT. The time now is 07:01 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki