Archon preamp tube layout chart?

Discussion in 'Amplifiers' started by rockridge98, Mar 16, 2015.

  1. rockridge98

    rockridge98 New Member

    Joined:
    Mar 15, 2015
    Messages:
    3
    Likes Received:
    0
    I like getting more use out of the gain knob in high-gain amps by putting a 5751 instead of a 12ax7 in the right position of the overdrive channel.
    I'd like to do this with my Archon 25 combo.
    Anybody have an Archon preamp tube layout chart or know which tube position this would be in the Archon?
     
  2. rising farce

    rising farce New Member

    Joined:
    Aug 10, 2014
    Messages:
    44
    Likes Received:
    4
    Here's the Archon 100 pre-tube layout, per PRS. I suspect the 25 is the same.
    V1 - Input
    V2 - Lead gain
    V3 - Lead gain
    V4 - Clean gain
    V5 - Phase inverter
    V6 - Effects loop (located closest to power tubes)
     
    vchizzle likes this.
  3. rockridge98

    rockridge98 New Member

    Joined:
    Mar 15, 2015
    Messages:
    3
    Likes Received:
    0
    Awesome, thanks!
    Stupid question, but V1 is the tube closest to the input jack, right?
     
  4. rising farce

    rising farce New Member

    Joined:
    Aug 10, 2014
    Messages:
    44
    Likes Received:
    4
    Correct.
     
  5. vchizzle

    vchizzle Birdman.

    Joined:
    Apr 28, 2012
    Messages:
    6,314
    Likes Received:
    2,239
    I don't understand why all tube amps don't come with a chart. Could be a simple 1/2 sheet of copy paper diagram. The kinda tricky one on this amp is V4 being the clean gain.
     
  6. WeFixFlats

    WeFixFlats Respect The Clave

    Joined:
    Jun 1, 2014
    Messages:
    1,228
    Likes Received:
    672
    You bring up a mega sore point here. And it's been discussed at length by the community over several posts and months with no satisfactory conclusion:

    PRS Support still doesn't have online manuals for either the Archon or the HXDA amps.
     
    #6 WeFixFlats, Mar 28, 2015
    Last edited: Mar 28, 2015
  7. Ben

    Ben New Member

    Joined:
    Sep 5, 2016
    Messages:
    23
    Likes Received:
    4
    Quick question. Are all the preamp tubes in the Archon 12ax7's?

    I'm not sure if the phase inverter, for example, should be a 12at7....
     
  8. LSchefman

    LSchefman Hears Tones

    Joined:
    Apr 26, 2012
    Messages:
    20,311
    Likes Received:
    9,695
    For some reason I recall my HXDA and DG amps coming with tube charts stickered to the inside of the head box.

    Edit: I just took a look at the back of the amps, and saw the tube chart for the HXDA peeking through the bottom. I know the DG30 has one as well, I just don't remember where they put it.

    Anyway, I'd be surprised if the Archon came without one.
     
    #8 LSchefman, Aug 15, 2017
    Last edited: Aug 15, 2017
  9. vchizzle

    vchizzle Birdman.

    Joined:
    Apr 28, 2012
    Messages:
    6,314
    Likes Received:
    2,239
    I'm 99% certain all are 12ax7 in the Archon.
     
  10. DreamTheaterRules

    DreamTheaterRules Archon owning member

    Joined:
    Nov 20, 2013
    Messages:
    3,740
    Likes Received:
    4,655
    Yeah, I felt silly making this same post a few weeks after I got my H, only to look inside the back and see the tube layout on the inside of the amp. When all else fails, take the back cover off and look! :)
     
  11. bodia

    bodia Authorities said.....best leave it.....unsolved

    Joined:
    Jan 21, 2015
    Messages:
    12,391
    Likes Received:
    12,480
    I don't think there is a chart inside the Archon. Seems to me there was a similar post about a year ago. Someone was looking for the layout and said there was no chart inside. Can't seem to find it now.
     
  12. LSchefman

    LSchefman Hears Tones

    Joined:
    Apr 26, 2012
    Messages:
    20,311
    Likes Received:
    9,695
    I think it would be a good idea if they had manuals, too, even very brief ones, like the one for the Grissom amps.

    Granted, most stuff is fairly self-explanatory if you know your way around amps, but there are helpful details that players might like to know.
     
    #12 LSchefman, Aug 16, 2017
    Last edited: Jul 24, 2018
  13. Ben

    Ben New Member

    Joined:
    Sep 5, 2016
    Messages:
    23
    Likes Received:
    4
    I think you are right. The Archon preamp tubes are all 12ax7's. But I tried a long plate 12at7 for the phase inverter and really like the effect. The distortion is smoother than with the ECC83 that was in there. I like JJ ECC83's for all the other positions though....
     
    shimmilou likes this.
  14. shimmilou

    shimmilou New Member

    Joined:
    Mar 15, 2018
    Messages:
    228
    Likes Received:
    275
    My favorite PI tube, I use them in several amps. I also like a 5751 in V1 for many high gain amps.
     
  15. Lyric

    Lyric New Member

    Joined:
    Apr 8, 2018
    Messages:
    72
    Likes Received:
    44

    Link should help below, follow the link and scroll down to Elvis’s post of the diagram.



    https://forums.prsguitars.com/threads/anyone-have-archon-tube-info.16973/

    This might help, if you scroll down you’ll see where Elvis posted a diagram of what PRS told him were the layout of the tubes and what tubes are used.

    The preamp tube closest to the power tubes is the Phase Inverter (V5). The FX Loop tube (V6) is in the front left side according to the chart Elvis posted.
     
  16. Lyric

    Lyric New Member

    Joined:
    Apr 8, 2018
    Messages:
    72
    Likes Received:
    44
    Btw curious but the preamp tubes can be swapped separately without matching or anything?

    I looking to switch some of the preamp tubes. Any recommend anything besides 12ax7? Like 12at7? 12au7? 12ay7?

    I wanna try different tubes for the FX Loop and maybe another tube or so.
     
    #16 Lyric, Jul 23, 2018
    Last edited: Jul 23, 2018
  17. shimmilou

    shimmilou New Member

    Joined:
    Mar 15, 2018
    Messages:
    228
    Likes Received:
    275
    Preamp tubes are plug and play, and any of the tubes you mentioned, and a 5751, are all interchangeable, and each have different gain factors. Just be sure to power off the amp before swapping tubes.

    Here is a good demonstration about the different gain factors:
    https://www.thetubestore.com/gain-factor
     
  18. elvis

    elvis Hamfisted String Banger

    Joined:
    Feb 29, 2016
    Messages:
    1,407
    Likes Received:
    1,456
    From back in the day. Chart included.

     
  19. Lyric

    Lyric New Member

    Joined:
    Apr 8, 2018
    Messages:
    72
    Likes Received:
    44
    Thank you

    So if I what tube do you recommend for this:

    I want my clean to stay clean clean of course but more smooth and not so ice picking like? I love lots of headroom on my Clean Channel and do not like early breakup which the Archon Clean Channel is great at plenty of great Clean headroom - which I love and wanna keep. I would just like the tone the highs down a little and make a little more mellow cleans with good hifi and keep the great clean headroom. Sometimes the clean channel is so ice picking shrill like it seems. Any recommendations?

    And do you have any recommendations for the FX Loop tube replacement. I believe the FX Loop could be and would be better with a tube change.

    Thanks
     
  20. DreamTheaterRules

    DreamTheaterRules Archon owning member

    Joined:
    Nov 20, 2013
    Messages:
    3,740
    Likes Received:
    4,655
    V 1 or V4... check and see what they are, and if not JJ, replace one or both with JJ (assuming we're talking only new tubes). JJ will tame the top end.

    That was the answer to your question. Perhaps a better solution though is somewhere else in the chain... reduce presence or treble, make sure speakers are broken in, use good guitar cables...remove any pedals with bad buffers from in front of the amp, etc.
     
    bodia likes this.

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice