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FDP Forum / Fender Amps: 1985 - Current / Update on my wine red drri post tube swap

budg
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ohio

Home of the Goodyear blimp
Aug 21st, 2018 04:25 PM   Edit   Profile  

I thought I would give an update on my amp as I was once considering selling it because it sounded too bright and sterile. My strats clean sounded really bad. Just didn’t seem to have any warmth in it at all.

I decided to check the bias to which I raised it to 20,5 from 19. Definitely a big improvement. I decided to order some JJs from one of our sponsors Antique Electronics aka tubesandmore. Great service btw.

Got the JJs (I like JJs in my Fenders for some reason). Installed the JJs and ended up raising the bias up slightly to about 22 ma. To my ears they sounded better. Have been playing the snot out of it ever since and the speaker is finally breaking in.

Even though I’ve had it for almost 3 years it didn’t get played that much because it didn’t sound that great. I really like the p12q speaker. It breaks up a little earlier than the stock speaker, so I get a slight breakup with my volume at almost 5 if I hit the strings hard enough. Another thing is it’s also lighter than the stock speaker . The amp weighs about 36.5 lbs instead of the 42 lbs. Almost as light as my Princeton.

Well just thought I’d give an update as I am always curious when people make tweaks if they were happy with the changes.

jhawkr
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Wichita, KS USA

It's all gravy from here on...
Aug 22nd, 2018 07:00 AM   Edit   Profile  

I retubed mine in 2013 with re-branded RCA power tubes, RCA preamps except one Mullard and a NOS RCA rectifier tube. If I recall I also set bias @ 22ma. It's my most used amp and still playing great with the mixture of NOS and UOS tubes. The P12Q is a wonderful speaker in the DRRI and mine is well broke-in by now! ;o)

budg
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ohio

Home of the Goodyear blimp
Aug 22nd, 2018 08:14 AM   Edit   Profile  

Good to hear. This thing was imo biased cold from the getgo. I think bumping it up to 22ma really got this thing to sing. I’m glad I didn’t unload it without knowing why it didn’t sound good. I’m also glad I kept the original speaker too. It’s a great fit . I wonder how many people change speakers without checking bias and allowing the speaker to break in.

Leftee
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VA

Aug 22nd, 2018 09:48 AM   Edit   Profile  

Cold bias helps the manufacturer get the amp through the warranty period on the original set of output tubes. Marshall did this in the 80s.

You make a great point. I always check bias first on an amp before I do anything else to it. And cold bias isn’t that hard to rocognize, IMO. It makes the amp sound sterile. There isn’t the harmonic content you expect to hear from a tube amp.

budg
Contributing Member
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ohio

Home of the Goodyear blimp
Aug 22nd, 2018 10:28 AM   Edit   Profile  

Yep. Now that I know what one sounds like with a cold bias it is easy to fix. Have t had to clip the bright cap even. It is now my favorite sounding amp . Tons of warmth and it just sings now. Lesson learned.

(This message was last edited by budg at 02:52 PM, Aug 22nd, 2018)

FDP Forum / Fender Amps: 1985 - Current / Update on my wine red drri post tube swap




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