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Vintage threads from the first ten years
Re: mods to my Deluxe reverb
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 6/17/1999 5:55 PM |
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| SpeedRacer | Re: mods to my Deluxe reverb A good collection to be sure.. Two of my faves (nothing earth shaking but while we're here..) 1. when you install a proper 3-wire cord and dissconnect the ground ("death") switch, run a twisted pair of wires to the trem pot and use the switch to take your trem in and out of your circuit. Lovely gain boost. 2. Install a 5K-10K lin pot in the ext speaker jack and wire it on the speaker side of the feedback resistor (the 820 ohm). Wire it as a rheostat, so that at "0" you have stock -fb levels, and as you turn it you go to nearly no -fb. 3. Beg borrow or steal an original P12N or an old Greenback.. or (my fav for the 60's thing) a gold label ceramic Jensen from a Twin (heavy duty!) |
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| 6/18/1999 7:58 AM |
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Bruce/ Mission Amps |
Re: mods to my Deluxe reverb/longish again /
Ok... I like that! Just use decent low loss coax cable from the jacks to the grid load resistors so you can take advantage of it. /
(hope the html stuff still works...if not, forgive me.) I don't see how a weenie 330pF cap across the 68K resitor would do anything Trace. The resonant freq of that is around 7Khz. Did you mean .33uF? or larger? You'd be better off using a 22K resistor with no cap instead of the 68K. That way when in the hot jack, you'd have the 22K and 68K in parallel for a total of 16k5 and when in the low gain jack the voltage divider would have less loss then two 68K resistors in series to ground. The mid boost using a diferent value mid resistance is OK too but anything more then 25K gets away from the BF Fender sound too much... IMO. Some old Vibro-Champs used a 15k here and sound pretty good. I try a 10k to 15K resistor first instead of installing a pot. The use of a 1M volume control with a DPDT push pull switch to bypass a new 56k mid resistor with a 15K on the switch will make the amp sound like it's supercharged... especially if you use the other set of contacts to bypass the tone stack with a .01uF/630v cap to the top of the treble pot or the volume control... Katie Bar the DOOR!! If you like more of a death metal sound, you'd want to go lower on the mid value resistor. Oh yeah, the vibrato intensity pot ground or break mod is way cool. What ever configuration you use will sound like you clicked in an extra mid gain stage, creating a solid boost to the driver stage, (well less loss when lifted). The 330uF/820 ohm Ck/Rk mod might be OK for the Strat bridge pickup only sound but IMO way to far with a neck pickup or any higher output humbucking pickup. As a matter of fact, I'd do it a different way and try a 10uF/1K5 combo on the first preamp triode stage and use a 250pF treble cap, .047uF bass cap and a .022uF mid cap. The tone recovery stage can stay at 22uF to 33uF and 1k5ohms followed by a good .022uf/630v cap. I didn't follow the 250pF cap to ground one Trace. What does the ground end of the tone end mean? Shunting the entire pot with the 250pF cap? The treble pot is not really grounded so I got lost here. Don't go crazy with the PI/driver coupler cap and go over .0047uF. First try a smaller polypropylene .0016uF/600v cap and go up to about .0033uF. The FB resistor is a tricky one because there is not really that much voltage there when the 820 ohm resistor is sitting on top of a little 47 to 100 ohm grounded resistor. Try a 2k7 in place of the 820 and bypass the 47 to 100 with a cheap radial .47uF to 1uF E-cap... or equivalent. I'd also like to say that you should NOT try all these mods at once or you'll end up with a Zoombie Woof-Woof amp. That's a dollar and change! Bruce Mission Amps | ||
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| 6/18/1999 1:29 PM |
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| anonymous | "WIDE-INPUT": Everyone seems to love this so give'er a try and see what you think ---> solder a 330pF 1kv ceramic cap across the 68K resistor on #2's jack before soldering it to the grid pin. This produces a much "wider", thicker, creamier tone. It's truly a wonderful thing!!} (hope the html stuff still works...if not, forgive me.) ~~~I don't see how a weenie 330pF cap across the 68K resitor would do anything Trace. @@@ To be completely honet with you Bruce mathmatically speaking I have no idea what it does!! (ha, ha) All I no is it makes a really cool difference. Try it and see if you hear a difference. I've done in it on band masters and what not and it works the same. Ohhh..the coax cable is a real good idea!! Nice touch  The only time I normally have to hook up to the Ampage is early in the AM and I'm not fully awake. The fingers work but the brain needs a jump start every now and again (ha, ha)
~~~The resonant freq of that is around 7Khz. Did you mean .33uF? or larger? @@@ I've been using a 330pF ceramic 1kv cap actually. Again, I coud tell you what it does mathmatically. It sounds cool to me and a those I've done it for. See what you think Bruce and maybe you can tell me what it does then I'll know!! (ha, ha) ~~~You'd be better off using a 22K resistor with no cap instead of the 68K. That way when in the hot jack, you'd have the 22K and 68K in parallel for a total of 16k5 and when in the low gain jack the voltage divider would have less loss then two 68K resistors in series to ground. @@@ I'll give that a whirl!!! ~~~The mid boost using a diferent value mid resistance is OK too but anything more then 25K gets away from the BF Fender sound too much... IMO. @@@ Try that 330pF and see what sounds like to you...it still sounds like a fender to my crazy 'ol ears. ~~~The 330uF/820 ohm Ck/Rk mod might be OK for the Strat bridge pickup only sound but IMO way to far with a neck pickup or any higher output humbucking pickup. @@@ It worked for the Les Paul Custom I used...but again I did all the mods so perhapes it a combo of all the parts that makes it work. ~~~As a matter of fact, I'd do it a different way and try a 10uF/1K5 combo on the first preamp triode stage and use a 250pF treble cap, .047uF bass cap and a .022uF mid cap. The tone recovery stage can stay at 22uF to 33uF and 1k5ohms followed by a good .022uf/630v cap. @@@ This sounds pretty good too! I'll try this
~~~I didn't follow the 250pF cap to ground one Trace. What does the ground end of the tone end mean? Shunting the entire pot with the 250pF cap? The treble pot is not really grounded so I got lost here. @@@ Opss..I thing my fingers got ahead of my brain here...basically copy the Tremolux 6G9-A's bass and treble pots. My goof. ~~~I'd also like to say that you should NOT try all these mods at once or you'll end up with a Zoombie Woof-Woof amp. That's a dollar and change! Bruce Mission Amps @@@ Mighty good point here!!! You rock Bruce Trace |
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| 6/17/1999 2:13 AM |
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| M/J |
Re: mods to my Deluxe reverb I agree with MJ (no relation)on the pickups of your guitar being a factor. I have a DR, Tele, and Strat. In my tele I have Lindy Fralin pickups. It sounded sweet through the DR. My Strat on the other hand had first, stock pickups which were piercing and thin as you say, and second Seymore Duncan Alnico Pro 2's which were a thicker but still piercing. I went to Lindy Fralin blues specials with staggered post and alnico magnets and its creamy smooth. Now both guitars sound great through the DR. As was stated in this thread I also had a LP Custom that sounded terrible through this amp. It weighed a ton so I sold it. If you haven't tried a set of Lindy's you might want to. They are pricey at $230 a set with the base plate but it was the ticket for me. I don't think I would do the modding to the amp till I tried some other pickups. Take your amp to a local guitar shop and try some of the custom strats through it. If you find one that sounds great....ask the salesman what kind of pickups are in it and buy a set. Just my 2 cents. M/J |
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| 6/17/1999 3:48 PM |
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| nic | I have pick ups other than stock in both the tele and strat, in the tele I have a seymour duncan 1/4 pounder, sounds great but a little thin. The stock neck pick up is my main stay, it's one of those '72 custom humbucker types. In the strat I have SRV's they sound great through my older Super but terrible through the RI Deluxe. This is something I forgot to mention before, the deluxe is a Reissue! So the components are are all board mounted, (not the tubes!) I have read a lot about value drifting and amp tone (torres). What are some typical values of components that people like to 'backdate' their sound to? I think I am going to have one channel set up for the strat and one for the tele. Maybe I'll like the modded channel so much I'll do both the same way. It's funny cause I'd like to believe in mystic when it comes to good sounding guitars and amps. I use to hate my new deluxe when I first bought it I mainly played strat at the time. I thought the amp was so stale and thin. Now that I use the tele more I began to believe the amp was getting it's own soul, you know how those clones don't come with thier own!  Unfortunately not true as it sounded bad with the strat again. (unless the strat is losing it's soul as I haven't played it in a long time.) |
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| 6/18/1999 5:34 PM |
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| Steve Dallman |
Your SR has a .01 uf coupling cap between the preamp and the phase inverter. Your DR has a .001 uf. It chokes off the low end. Change the .001 to a .01 or even a .02 and your thin problems are over. (If you go too large you may get motorboating.) Switch to the 6L6's, properly bias it and don't look back. You may also want to try a 12AX7 in the phase inverter position instead of the 12AT7. (Next to the power tubes.) If you don't use the normal channel you may pull the first preamp tube out for a little increased gain in the vibrato channel and it eases the heater load. |
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