Results 1 to 9 of 9

Thread: 6gw8 replacement?

  1. #1
    Junior Member
    Join Date
    Feb 2009
    Location
    melbourne, australia
    Posts
    18

    6gw8 replacement?

    hi all, i have recently bought an old aussie made amp that needs a pair of 6gw8(ecl86) tubes to be up and running. its been fully restored and converted from PA to guitar use but the seller kept the tubes because theyre so hard to come by...basically i was wondering if there are other tubes that will work in their place? theres some 6gv8 valves available nearby or maybe el84's? nah, that'd be too easy!! any help appreciated, thanks for looking, seb.

  2. #2
    Senior Member
    Join Date
    Apr 2007
    Location
    sydney australia
    Posts
    822
    6gw8's are a triode and power pentode in one valve. you could maybe aproximate it with 1/2 a 12ax7 for the triode and a el84 for the pentode if you dont mind an extra tube... theres also 6bm8's, but their not that cheap an option.

    evatco also has some nos and used 6gw8's http://www.evatco.com.au/webcat1p3.htm

    would be easier than trying to rewire the amp for something else.

  3. #3
    Junior Member
    Join Date
    Feb 2009
    Location
    melbourne, australia
    Posts
    18
    thanks for that, ive tried evatco and theyre trying to get some in from o/s. ive called a heap of places but no joy anywhere, hence the search for an equivalent.

  4. #4
    Senior Member
    Join Date
    Apr 2008
    Posts
    255
    6F3P is the russian 6BM8 equivalent, probably available in bulk cheap...may require some redesign, but plenty available.

  5. #5
    Member
    Join Date
    Apr 2008
    Location
    Australia
    Posts
    77
    I was going to offer to lend you some 6BM8, but they have a different pinout and lower voltage ratings.

    Here are some local 6GW8 on fleaBay - http://cgi.ebay.com.au/2-X-PHILIPS-M...3A1|240%3A1318

  6. #6
    Junior Member
    Join Date
    Feb 2009
    Location
    melbourne, australia
    Posts
    18
    thanks andrew, ive actually already got a bid on those, fingers crossed! cant wait to get the little beast up and running...

  7. #7
    Supporting Member tubeswell's Avatar
    Join Date
    Feb 2007
    Location
    Wellington NZ
    Posts
    3,903
    FYI there's a couple for sale on the kiwi flea bay at the mo'

    http://www.trademe.co.nz/Electronics...-210846398.htm
    Building a better world (one tube amp at a time)

  8. #8
    Junior Member
    Join Date
    Feb 2009
    Location
    melbourne, australia
    Posts
    18
    thanks for the help guys, i actually just received 10(mix of aussie made mullard, miniwatt, awa, and radiotron)6gw8's from ebay. the conversion is actually not complete, it still has the original PA output transformer. i won some speaker line transformers on ebay last night(thank god for ebay!) and once i get them worked out should have a nice little amp. i actually tried it with the new valves last night and was pleasantly surprised by the warm tone and sustain and a sweet break up until about halfway on the volume, then the break up becomes quite flubby and unusable(using a celestion vintage 30).... will the speaker line output transformers remedy this? do i connect the OT's to the speaker output directly, apparently the amps out is 8ohms and the new OT's are 4ohms, do i connect a pair in parallel?(i have 4 of them).anything more complex i'll take it to a local tech, i'm just hoping its a simple install. here's the OT's... http://cgi.ebay.com.au/ws/eBayISAPI....m=120396224663 .any help appreciated, thanks for looking!

  9. #9
    Senior Member
    Join Date
    Apr 2008
    Posts
    255
    I think the 70v and 25v PA lines are like 100-200 ohms and 60 ohms or so, but I'm not sure. That would not be working right with an 8 or 16 ohm speaker attached. Instead of using Amp->OPT->Speaker Matching->Speaker setup, have you considered just using some different OPTs? It's generally not hard to swap opts...after you get the rivets out . I've never really used the 6gw8s, just the 6bm8s and they seemed to like a load between 7k and 10k ohms, a lot like a 6K6. Plenty of old radios used 6k6 or 6F6, so there are probably some nice vintage OPTs available. Of course the line matching transformers work, and they do give you the option of running speakers in every room .

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Speaker replacement
    By JorisFun in forum Music Electronics
    Replies: 6
    Last Post: 09-09-2008, 08:34 AM
  2. cap replacement question
    By rexindigo in forum Guitar Amps
    Replies: 10
    Last Post: 06-23-2008, 08:14 AM
  3. Ok replacement piece?
    By Andy S. in forum Other Amps
    Replies: 2
    Last Post: 11-14-2007, 02:09 PM
  4. Replacement PT for a JCM800
    By Andrei_T in forum Maintenance, Troubleshooting & Repair
    Replies: 11
    Last Post: 05-16-2007, 09:38 PM
  5. Replacement OT for EKO?
    By TheEHMan in forum Maintenance, Troubleshooting & Repair
    Replies: 1
    Last Post: 05-13-2007, 03:33 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •