PP amp using 6p15P - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

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

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 11th July 2007, 05:16 AM   #1
pwan is offline pwan  United Kingdom
diyAudio Member
 
Join Date: Apr 2006
Location: Earth
Default PP amp using 6p15P

Hi,

My friend having 6P15P, 6N1P, 12AX6 & transf 250-0-250 - 250ma) around. Could you advise the good PP schematic that make use of these parts?

Thanks!
  Reply With Quote
Old 12th July 2007, 03:15 AM   #2
diyAudio Member
 
Join Date: Apr 2004
Location: Monroe Township, NJ
6p15p = SV83 = EL84N. The thing to watch out for is the fragile screen grid.

Follow the general pattern of the Dyna ST35. 12AX7 voltage gain block DC coupled to 6n1p "concertina" phase splitter. Both small signal tubes would be shared between the 2 channels.

SS rectify the B+. A separate filament winding, with a CT, for the 6n1p is a good idea. The CT is used to bias the heater off B+, which ensures the heater to cathode potential limit is not exceeded..

Are there any filament windings on the 250-0-250 power trafo?
__________________
Eli D.
  Reply With Quote
Old 23rd September 2013, 02:43 AM   #3
maton00 is online now maton00  Mexico
diyAudio Member
 
maton00's Avatar
 
Join Date: Feb 2012
Location: Queretaro
Send a message via MSN to maton00
Can it be done the same like a elevated heater but at some 150 volts in order to keep the screen grid dissipation at a max of 1.5W? is it really
(10mA) at 150V Max?
  Reply With Quote
Old 23rd September 2013, 03:05 AM   #4
diyAudio Member
 
Join Date: Apr 2004
Location: Monroe Township, NJ
Elevating the heater does nothing for screen grid fragility. Use full pentode mode "finals" and regulate g2 B+ with an 0A2.

The 6П15П (6p15p) data sheet is here. If you can source 6П15П-EB (6p15p-ev) stock, do so. The milspec tubes are better.
__________________
Eli D.
  Reply With Quote
Old 23rd September 2013, 03:35 AM   #5
maton00 is online now maton00  Mexico
diyAudio Member
 
maton00's Avatar
 
Join Date: Feb 2012
Location: Queretaro
Send a message via MSN to maton00
I do think a gas discharge regulator could be a little bit dangerous, because those things die very quickly, I'm afraid of getting 300volts in the screen in a catastrofic event
When i said "the same like a elevated heater" I was thinking of a voltage divider to supply the screen, but what about of the 10mA for a max of 1.5W of disipation, could it be better a string of zenners or a regulated mosfet supply?
What do you think could be better?

Last edited by maton00; 23rd September 2013 at 03:48 AM.
  Reply With Quote
Old 23rd September 2013, 07:24 AM   #6
diyAudio Member
 
Shoog's Avatar
 
Join Date: Aug 2002
Location: Eire
Quote:
Originally Posted by maton00 View Post
I do think a gas discharge regulator could be a little bit dangerous, because those things die very quickly, I'm afraid of getting 300volts in the screen in a catastrofic event
When i said "the same like a elevated heater" I was thinking of a voltage divider to supply the screen, but what about of the 10mA for a max of 1.5W of disipation, could it be better a string of zenners or a regulated mosfet supply?
What do you think could be better?
This is not my experience. A salvaged VR150 has been doing stirling service in one of my amps for years. They are most likely to fail on power up and that should be obvious and a quick blast of higher voltage on the screens will do little harm.

However a MOSFET off as resistor divider reference string is easy to implement and should do excellent service.

Shoog
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
6P15P Tubes: Push Pull Possible? maal1605 Tubes / Valves 95 15th May 2013 11:11 PM
6P15P hybrid amp schema? L30N^_^H34RT Tubes / Valves 16 19th January 2008 05:20 PM
New SE 6P15P project chrish Tubes / Valves 21 21st December 2007 04:35 PM


New To Site? Need Help?

All times are GMT. The time now is 02:47 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2