Search found 1411 matches

by clutch71
Fri Mar 30, 2012 6:53 am
Forum: Rectifier Series
Topic: Want Pre500 tone? Here's how to get it!
Replies: 462
Views: 82049

Re: Want Pre500 tone? Here's how to get it!

Liking what I am hearing here! Does anyone know if changing out the gain pot on a 3ch for a higher value would have a similar tone/gain improvement? I'd have to say yes in theory if the gain post are 250k and if the snubbing capacitor @ V2A is .01. That's also why I'm curious on the Single Recs and...
by clutch71
Fri Mar 30, 2012 6:34 am
Forum: Rectifier Series
Topic: Want Pre500 tone? Here's how to get it!
Replies: 462
Views: 82049

Re: Want Pre500 tone? Here's how to get it!

The Pre-500 transformer myth was disproved years ago... I'm not sure it has been disproved other than the fact that the Mark III transformers run well past the 500's into the 2200's. The primary impedance of a transformer would effect tone. I had a VTM 60 that I modded from 6L6 to EL34 but did not ...
by clutch71
Thu Mar 29, 2012 10:56 am
Forum: Rectifier Series
Topic: Want Pre500 tone? Here's how to get it!
Replies: 462
Views: 82049

Re: Want Pre500 tone? Here's how to get it!

The stock cap (.01uF) code reads SBE 715P (400V) 502K 9821 The new cap (.0047uF) reads SBE 715P (600V) 472J 1112 Thanks that makes sense. .0047 would allow less bass and low mids to pass. Measuring the primary impedance should only be done by someone with the knowledge, skill, and experience to do ...
by clutch71
Thu Mar 29, 2012 6:30 am
Forum: Rectifier Series
Topic: Want Pre500 tone? Here's how to get it!
Replies: 462
Views: 82049

Re: Want Pre500 tone? Here's how to get it!

I still don't understand why the change from 1m pots to 250 K pots? That's a pretty substantial swing. Most amps I've come across of similar design use 1m pots...I'm not doubting anyone here...posters did a great job of identifying the pots by posting pics of the reading. Just pointing that out. The...
by clutch71
Sun Mar 18, 2012 7:46 am
Forum: Rectifier Series
Topic: Want Pre500 tone? Here's how to get it!
Replies: 462
Views: 82049

Re: Want Pre500 tone? Here's how to get it!

On to the mod! 1. Change the gain pots to 1MA. Make sure you swap the cap that jumps the two lugs to the new pot. 2. Swap this capacitor to one valued at .005uF, with a voltage rating of at least 450. (0.0047uF Orange Drop is perfect) This should do it! Of course, changing the Red presence control ...
by clutch71
Wed May 04, 2011 7:59 pm
Forum: Rectifier Series
Topic: I finally pulled the trigger on a Rectoverb!
Replies: 11
Views: 1006

Re: I finally pulled the trigger on a Rectoverb!

But it is a very simple mod to do if you have a little soldering experience. I did it on my 5150 head and it turned out perfect. It's just a matter of tracking down the correct resistor and cutting it out and replacing it with a pot and resistor in line. It really changed the tone for the better on...
by clutch71
Tue May 03, 2011 2:14 pm
Forum: Rectifier Series
Topic: I finally pulled the trigger on a Rectoverb!
Replies: 11
Views: 1006

Re: I finally pulled the trigger on a Rectoverb!

The OP bought an amp that was already modded w/ bias trim pots and test points. Without that, your bias is fixed by resistors and no way to adjust.
by clutch71
Sun Apr 24, 2011 7:40 am
Forum: Rectifier Series
Topic: I finally pulled the trigger on a Rectoverb!
Replies: 11
Views: 1006

Re: I finally pulled the trigger on a Rectoverb!

The standard value on a standard bias is -38v to -48v for EL 34 and -40v to -48v for 6L6. There is a lot of mathmatics involved but this is a general rule. Not sure how familiar you are with biasing in this method but a couple of tips...turn the amp on under load (stand by off meaning no sound guita...
by clutch71
Sun Mar 27, 2011 8:27 am
Forum: Vintage Amps (Before 1991)
Topic: Why did they ever stop making the DC series?
Replies: 15
Views: 1806

Why did they ever stop making the DC series?

I had an opportunity to play a DC-3 for an extended length yesterday. I have to say that it's one of the best Mesa's I've ever played. As an amp buyer and basement hack...i'm relatively conservative when if comes to buying gear sight unseen. In my travels I've only seen 2 Mark Iv's and only had the ...
by clutch71
Wed Feb 02, 2011 7:04 am
Forum: Rectifier Series
Topic: Roadster needs more gain!!
Replies: 34
Views: 3584

Re: Roadster needs more gain!!

AS others have stated the Roadster has plenty of gain. I got to think though that if your happy with channels 1-3, then the issue could be the tube responsible for channel 4. Channels 3 and 4 are not voiced identical but can be dialed to sound similar. More tweakking could apply. I also doubt that t...
by clutch71
Mon Jan 24, 2011 6:18 pm
Forum: Rectifier Series
Topic: PRE 2010 Duel Rec and Cab
Replies: 7
Views: 719

Re: PRE 2010 Duel Rec and Cab

Thanks for the replies. Unfortunately, no amp this go around :x , return not big enough this year. DR is in the future, I'm going to keep looking around and test driving. A lot of us are in that boat. That link I provided is searchable by state or region. Great site I heard about on this board and ...
by clutch71
Sun Jan 23, 2011 9:47 am
Forum: Rectifier Series
Topic: PRE 2010 Duel Rec and Cab
Replies: 7
Views: 719

Re: PRE 2010 Duel Rec and Cab

I'd say if your patient $1500 USD is more likely. Especially through CL. I paid $325 for my 2x12 cab w/ leather cover in pristine condition. Right place...right time. Go for an older 2ch Rev G and higher and you can probably drop that down to $1350 http://instrument.jaxed.com/cgi-bin/music.cgi?cat=m...
by clutch71
Fri Jan 07, 2011 10:46 pm
Forum: Modern Era Amps (1991-Present)
Topic: Single rect + maxon tubescreamer 808
Replies: 4
Views: 493

Re: Single rect + maxon tubescreamer 808

What Cab are you using? Always recommend cabs smaller than the Oversized recto, cab get a little boomy...everyone has covered the settings and I agree with most except I'd bring the mids up a little more. Rectos are low in the mid range so it may help. EL34's will help too. But stay away from the Tu...
by clutch71
Sun Dec 19, 2010 7:26 am
Forum: Vintage Amps (Before 1991)
Topic: Sell me on a MArk IV
Replies: 8
Views: 1024

Re: Sell me on a MArk IV

I run my Mark IV with JJ6l6 and SED =C= EL34's. I've gone through a ton of cabs trying to find the right match for what I'm trying to do and settled with a Marshall MF400 oversize 4x12 with G12K-100 speakers. This cab really lends to the bottom end giving my IV a more beefy rhythm sound while the E...
by clutch71
Sun Dec 19, 2010 7:16 am
Forum: Vintage Amps (Before 1991)
Topic: Sell me on a MArk IV
Replies: 8
Views: 1024

Re: Sell me on a Mark IV

The Mark IV will solve all your problems, as well as reduce your electrical bill and help contribute to world peace. As to whether you'll like the sound of it or not, I can't say as that's kind of a personal thing. It's funny that you say that. When I bought the VTM's I was looking for a JCM 800 to...