Modifying amp to accept different tubes (Newbie alert!) - 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 8th March 2005, 08:26 PM   #1
diyAudio Member
 
Join Date: Mar 2005
Location: Salisbury, UK
Default Modifying amp to accept different tubes (Newbie alert!)

Hello,

I have recently ordered a Bada ph-1 headphone amplifier. It uses two 6N16B valves. Having looked around the internet for replacements or equivalents I only turned up one site that is based in Russia.

The 6N16B is a small dual triode tube and it's soldered to the board of the headphone amp. My question is would it be possible to install a socket for a different valve on the chassis of the amplifier and install a different dual triode eg 12AX7 or ECC82? I understand the pin layout is different between valves so the heater, grids, plates etc.. would have to be wired up correctly but would this be possible assuming the new valve were to be wired up correctly or would I have to change resistor/capacitor values for the new valve?

Sorry for the possibly stupid questions but I am pretty new to Valves/tubes (Past experience is replacing caps and resistors in an old GEC radio)

Thanks.
  Reply With Quote
Old 8th March 2005, 10:18 PM   #2
Sherman is offline Sherman  United States
diyAudio Member
 
Join Date: Feb 2004
Location: Chicago area
Default Re: Modifying amp to accept different tubes (Newbie alert!)

Quote:
Originally posted by Pickledcreeky
Hello,

...would it be possible to install a socket for a different valve on the chassis of the amplifier and install a different dual triode eg 12AX7 or ECC82? I understand the pin layout is different between valves so the heater, grids, plates etc.. would have to be wired up correctly but would this be possible assuming the new valve were to be wired up correctly or would I have to change resistor/capacitor values for the new valve?

...Thanks.

Don't worry about the question! It is something everyone new to valves faces.

Unless the tube you are replacing the original with has the same values (max plate voltage, current etc.) you will most definitely have to make changes other than just soldering in a valve socket. What exactly you have to change depends on a few factors.

More than just voltage differences you need to know if the rest of the circuit can handle the output from your new tube or if your new tube is capable of driving the next stage. There are some amazingly knowledgeable people here so if you can post a schematic it is likely someone can give you the answers you need.
__________________
--Sherman
  Reply With Quote
Old 8th March 2005, 10:47 PM   #3
Colt45 is offline Colt45  Serbia
diyAudio Member
 
Join Date: Feb 2002
Location: Canada
Send a message via ICQ to Colt45
Here is a datasheet:
http://frank.pocnet.net/sheets/113/6/6N16B.pdf


Now go look around for something with similar curves, I'm too damn lazy.

I forget the numbers of some of the common domestic submini twin triodes. but- i wouldnt bother. I'm sure you can hunt down 6N16B for next to nothing, if you know the right people..
  Reply With Quote
Old 10th March 2005, 12:50 PM   #4
diyAudio Member
 
Join Date: Sep 2003
Location: London
why replace it? If it ain't broke, don't fix it. Just because it's the fashion to 'tube roll' doesn't mean that original equipment has to be torn out on principle. If you want to be able to replece it at some point, speak to Edicron. www.edicron.com. Bear in mind there are some really excellent russian tubes, and they may well be better than your average ECC83
  Reply With Quote
Old 10th March 2005, 03:08 PM   #5
diyAudio Member
 
Sch3mat1c's Avatar
 
Join Date: Jan 2003
Location: Milwaukee, WI
Send a message via ICQ to Sch3mat1c Send a message via AIM to Sch3mat1c
I'd look for a place in the case/chassis to mount a tube socket on a bracket and run pigtails. Takes care of any pinout variations, too!

Tim
__________________
Seven Transistor Labs
Projects and Resources
  Reply With Quote
Old 12th March 2005, 07:51 AM   #6
diyAudio Member
 
Join Date: Mar 2005
Location: Salisbury, UK
Thanks all for your replys!

Quote:
Originally posted by andyjevans
why replace it? If it ain't broke, don't fix it. Just because it's the fashion to 'tube roll' doesn't mean that original equipment has to be torn out on principle. If you want to be able to replece it at some point, speak to Edicron. www.edicron.com. Bear in mind there are some really excellent russian tubes, and they may well be better than your average ECC83
Hello Andy,

I am not about to replace the tubes just yet dont worry I have just heard a rumor that these tubes do not last that long (750 hours I was quoted) so just thinking ahead a little. As for the ECC83s the only reason I suggested those is someone I know has a few of them and has said I could have them.

Btw The link you gave me doesn't seem to be working.


Quote:
Originally posted by Sch3mat1c I'd look for a place in the case/chassis to mount a tube socket on a bracket and run pigtails. Takes care of any pinout variations, too!
Thats a very good idea also as the case is very small so it would take care o9f space issues with the sockets mounted on a seperate bracket

Quote:
Originally posted by Colt45 Here is a datasheet: http://frank.pocnet.net/sheets/113/6/6N16B.pdf

Now go look around for something with similar curves, I'm too damn lazy.

I forget the numbers of some of the common domestic submini twin triodes. but- i wouldnt bother. I'm sure you can hunt down 6N16B for next to nothing, if you know the right people..
Cheers for that!

Thanks all for taking the time to reply.
  Reply With Quote
Old 12th March 2005, 08:57 AM   #7
diyAudio Member
 
audiousername's Avatar
 
Join Date: Jul 2004
Location: Melbourne, Victoria
Quote:
Originally posted by Pickledcreeky
I have just heard a rumor that these tubes do not last that long (750 hours I was quoted) so just thinking ahead a little.
Umm... usually valves last longer than that. It isn't uncommon for small signal types to last for a few decades under normal use.

The 750 hours is quoted in the datasheet linked earlier in this thread by Mark. It might be that the valve is guaranteed to last at least 750 hours, but may last very much longer. These sort of guarantees are important in military service where the machine must be working, so the valves will probably be replaced anyway, just to make sure they don't fail at some other critical time.
__________________
Jason
  Reply With Quote
Old 12th March 2005, 06:41 PM   #8
Colt45 is offline Colt45  Serbia
diyAudio Member
 
Join Date: Feb 2002
Location: Canada
Send a message via ICQ to Colt45
Yes, I agree with audiousername.

the 750h is conservative rating, I think it applies to *minimum* life at *maximum* ratings.

since small signal tubes are usually run at a small amount of their ratings, they usually last a few decades..
  Reply With Quote
Old 12th March 2005, 10:14 PM   #9
diyAudio Member
 
Join Date: Mar 2005
Location: Salisbury, UK
Ok thats good news

Again, thanks for your help!

Cheers.
  Reply With Quote
Old 14th March 2005, 04:13 PM   #10
diyAudio Member
 
Join Date: Sep 2003
Location: London
Btw The link you gave me doesn't seem to be working.>

Edicron do the tube - www.edicron.com the link doesn't work from the text of this, but if you type it in seperately it works.
  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
Modifying an old Radio to accept an MP3 Player - help needed FoleyF Digital Source 3 25th June 2008 10:03 AM
Incoming....Newbie alert! TiiDM Introductions 2 23rd November 2007 08:54 PM
Advanced crossover setup (Newbie Alert) bezeek Parts 7 2nd January 2007 04:30 PM
Small value caps (newbie alert) alphabeta Solid State 3 18th September 2005 10:12 PM
JLH Class-A help needed! [newbie alert] w00t Solid State 13 30th September 2004 03:01 PM


New To Site? Need Help?

All times are GMT. The time now is 08:12 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