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 25th July 2008, 07:32 PM   #2151
poynton is offline poynton  United Kingdom
diyAudio Member
 
poynton's Avatar
 
Join Date: Mar 2005
Location: UK
Default Just acquired

It's a Philips Stereo record player amp.

2x ECC83 and 2x EL95

Volume (with loudness), bass, treble and balance

My summer project

(sorry - rubbish photo)
Attached Images
File Type: jpg 25-07-08_1839.jpg (28.8 KB, 3695 views)
__________________
If it ain't broke, break it !! Then fix it again. It's called DIY !
  Reply With Quote
Old 25th July 2008, 09:48 PM   #2152
Rodango is offline Rodango  United States
diyAudio Member
 
Rodango's Avatar
 
Join Date: Jul 2007
Location: Salem, OR
Send a message via AIM to Rodango Send a message via Yahoo to Rodango
Default Re: Re: Rodango Model DB-1 Bass Guitar Head

Quote:
Originally posted by FastEddy

... Wondering if those high temp wire wound resistors cause any questions/problems? Is this usual or do many 'philes replace 'em?
No, they work great and are the cathode bias resistors...
  Reply With Quote
Old 26th July 2008, 02:00 PM   #2153
jane is offline jane  Norway
diyAudio Member
 
jane's Avatar
 
Join Date: Jul 2004
Location: N-6600 Norway
Small SE "office amplifier" based on EF184 and 6L6C/KT66 (or any other tubes that fit into the socket) Distributed feedback: 3-4dB local shunt feedback and 8-9dB gNFB.

Click the image to open in full size.

Click the image to open in full size.


Jan E Veiset
__________________
Life is hard - Then you die.
  Reply With Quote
Old 26th July 2008, 09:50 PM   #2154
igormak is offline igormak  Russian Federation
diyAudio Member
 
igormak's Avatar
 
Join Date: Oct 2003
Location: Moscow
Hi Jane,
At last we see SE ultraline pentode paradise and in very good execution. Congrats!

Jane, how it sounds?
  Reply With Quote
Old 27th July 2008, 09:19 AM   #2155
JAMESBOS is offline JAMESBOS  England
diyAudio Member
 
Join Date: Jan 2007
Location: wigston leics england
Hi Jane,
Looks like a nice simple SE design, a sort of universal SE Amp, which can use several different valves of the same or very similar pin outs. I myself have built a universal SE Amp which can use about 14 different valves of the same general pin out!Although not quite as neat and simple as your design. I also used meters to set the different bias. I would like to build this design to compare it with mine. What is the B+Voltage. Do you use fixed bias? If so what is the original bias voltage? You must forgive my ignorance as I have no knowledge of the maths of building or designing Amps. I just follow the schematics and hope it works!!
If it doesn't I don't have the means of putting it right I just move on to the next schematic and keep my fingers crossed that I don't make any silly mistakes! My universal SE Amp is still working after about 6 years now so I must have done something right! It uses EL 38's as the Output valves and 6J5GT's for the input and a GZ37 as rectifier, at about 400Volts. Best regards Anthony.
__________________
HENRY
  Reply With Quote
Old 27th July 2008, 10:59 AM   #2156
jane is offline jane  Norway
diyAudio Member
 
jane's Avatar
 
Join Date: Jul 2004
Location: N-6600 Norway
Here is the power supply. The mains transformer is a Hammond 372JX. B+ is ~360Vdc. Bias is adjustable between ~25 and ~45V so most of the power tubes with 7AC/8EP pin layout will do the trick (EL34, 6550, KT66, 5881, KT90, etc).

Click the image to open in full size.

Jan E Veiset
__________________
Life is hard - Then you die.
  Reply With Quote
Old 27th July 2008, 01:53 PM   #2157
kmtang is offline kmtang  Canada
diyAudio Member
 
kmtang's Avatar
 
Join Date: Nov 2004
Location: Vancouver
Default Super Power Plate for my Preamp

Here is my latest Tube Regulated Power Supply for my new Preamp.

It includes Lundahl LL1650 power trans, 2x LL1623AM amorphous chokes as double choke filtering, 47+47uF Blackgate capacitor, and Tube Regulator (6EM7, 6U8A and 5651) based on HP400's schematic.

My wife said this monster sounds very nice but too expensive for me to keep.

http://photoshare.shaw.ca/messages/v...5065/page/1/15
Attached Images
File Type: jpg dscn2560.jpg (20.9 KB, 3551 views)
  Reply With Quote
Old 27th July 2008, 08:55 PM   #2158
speakerfritz is offline speakerfritz  United States
diyAudio Member
 
Join Date: Jul 2008
kmtang

you have a schematic for that power supply?
  Reply With Quote
Old 6th August 2008, 06:53 AM   #2159
mayham is offline mayham  Netherlands
diyAudio Member
 
Join Date: Apr 2007
Hi there,

Here's my latest creation. Still working on it though. Some issues with PSU transformer overheating and hum induced on the anode chokes. But that's almost fixed.....

Click the image to open in full size.

For more pictures on the build check my website. (-:

Next project is going to be a very tiny (REALY tiny) Push-pull amplifier using 6am4 and E90CC tubes. ((-:
__________________
Try to find a sane man; If you do, send him to me and I'll cure him.
  Reply With Quote
Old 6th August 2008, 07:29 AM   #2160
mayham is offline mayham  Netherlands
diyAudio Member
 
Join Date: Apr 2007
Oh yeah, btw. This is what it is:

'27 preamp using 5z3 for rectification and two huge 25h chokes. Included are two L1667 anode chokes. Five inputs, two outputs.

B+ running at 200v. Sounds like a charm (-:
__________________
Try to find a sane man; If you do, send him to me and I'll cure him.
  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 01:27 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