robrob
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  • Hi Rob,
    I'd like to thank you very much for your Amp stuff pages. Thanks to you I've been able to build my own 18w TMB from a Tube-town kit with all the mods i've in mind. The PPIMV type 2 works very fine. Also the type 3 is good but I've choose the most sought after PPIMV.
    Hey Rob, I'm building an amp for a guy that plays Tele's and steel guitar. I'm trying to give him more EQ control, especially for the steel guitar, and I saw this 4-band EQ. Have you ever used a 4-band EQ, and will this circuit provide him the mid controls he needs for steel playing? Thanks again for your knowledge and help.
    1656503522260.png
    Rob. Another thanks for your website. I'm assembling a MojoTone PR kit and following your suggested mods.

    I'm about to do the bias board and discovered that Mojo supplies a 100 uf 100 V electrolytic cap and your webpage show a 25 uf 100 V cap. Will using the 100 uf capacitor produce any negative effects?

    Thanks again. Ed Storer
    robrob
    robrob
    No, 100uF is a good upgrade.
    Transformer question: about to give up on a TSA15 combo that has gone silent, although the tubes still light up. Various online conversations don't cover this symptom, and I've already replaced some of the parts the Ibanez tech says it always is. The schematic sez the transformer is 250-0-250; can I use that in place of the 240-0-240 one in some of your smaller champ-inspired circuits? Thanks mulch!
    robrob
    robrob
    More than likely the 250-0-250 will work fine.
    Hey Buddy!

    I'm trying to find a VHT special six mod that converts the 16ohm speaker out into a recording line out.

    I thought I saw it in your stuff, but I cant find it anywhere.

    Can you help?

    Thanks TC.
    robrob
    robrob
    That mod is on my "Generic Amp Mods" page.
    Hello, I am also unable to download the DIYLC file link from any of you pages anymore. Thank you for all you do and sharing so much info. I've included a screenshot of where link sends me, tried from multiple browsers.
    thanks, alexhael

    Attachments

    • Capture DIY.PNG
      Capture DIY.PNG
      309.6 KB · Views: 72
    robrob
    robrob
    You have to right-click and select "Download" due to browser security setting changes.
    Hey Robrob, I'm trying to get the diy file for the Soldano-Nakid 6v6 on your site, but it doesnt redirect to a download. I just directs to a xml code. I'm hoping you can fix that. I'd love to get a board made and get to work on that amp!

    Thanks
    robrob
    robrob
    You have to right-click and select "Download" due to browser security setting changes.
    Hello Robrob. I have a VHT Ultra Combo coming and wanted to Blackface the clean "channel" and add headroom, and Brownface-ish the gain channel. Do you have any thoughts on the following mods?

    1 Switch speaker to a WGS G12C.
    2 BF the tone stack. Maybe add pots?
    3 Add switchable NFB like you have on the Princeton on your website.
    4 Add a raw switch, but put it on a pot.
    5 Bias for a 6l6.

    Thanks!
    Sorry, I was under the impression that you had close contacts with the admins.
    robrob
    robrob
    No, I don't even know who they are.
    Rob-------maybe you can help me. For the last couple of weeks, I cannot post on TDPRI. Computer works fine on all other sites,Won't allow a new membership it says that I didn't respond to the CATCHA, but it never show up on the screen. I have tried several approaches to contacting admin, but it kicks back every time. I would appreciate any help you can give me. Thanks----jackal.
    robrob
    robrob
    Sorry, I'm not an admin and I don't know any admins.
    Rob, First, a huge thank you for your web pages on tube amps.

    I'm starting a new project where I want to build a tube buffer for guitar that allows me to split the signal into two amps (buffer and Y-box in one). I've been reading about cathode followers, thinking 12au7 based, and wondering if you have written anything about Buffer circuits?

    Any tips on where I might ready more?
    Rob! Your website helped SO MUCH in building my 5f6a. Thank you so much. That was a while ago... Now I am an amp tech, fixing local players amps, pedals, etc... Thanks again!
    Hey rob, I read your webpage for hours last night, and it’s awesome! We have a lot in common. I appreciate your professionalism and passion for your hobbies. I’m a physician by trade, but like you, I love cars, guitars and now building a tube amp! Thank you for taking the time to post on this forum, and the incredible webpage you’ve created.
    Sorry Rob I should have been more specific,
    I was thinking in terms of using the Bandmaster OT to reduce headroom and make the Bassman overdrive at a lower volume.
    I wasn't worried about Physical space,
    Thanks Mike
    robrob
    robrob
    Then yes, you could use the BM OT. The amp wouldn't overdrive earlier but you would get more high volume compression and lose a little low end definition.
    Rob can you swap a OT from a Tweed Bandmaster into a Tweed Bassman ?
    Thanks Mike.
    robrob
    robrob
    I'm sorry, I don't know the answer to that. You may be able to get the chassis hole dimensions from Classictone's website.
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