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Messages - Stompin_Tom

#46
Preamps and Effects / Re: Hiwatt-based preamp
August 18, 2006, 09:44:23 AM
Sounding good! Nice solos...
#47
Amplifier Discussion / Re: Stereo to mono power amp
August 17, 2006, 05:29:00 PM
hmmm.. I had thought of that, and I do want that option, too. My only concern is if I show up to a gig where I'm borrowing someone elses cab and it's not stereo... That's why I want the option of bridging or paralleling or whichever. The other guitarist in my band has a 100watt boogie and I'll need the extra power...
#48
Preamps and Effects / Powering your preamps
August 17, 2006, 04:58:08 PM
I'm curious... how have others here who've made their own amps powered their preamps... I'm thinking of a 3886 chipamp and I'm considering my options for preamp, transformer, etc... separate transformer, or one with extra secondaries...etc.
#49
ah... so think of it as a wall wart. I mean regulate or whatever you have to do to get the voltage where you need it. Thanks!
#50
So, here's a noob question... RDV's preamp requires 15v... How do you power that from your poweramp transformer?... or do you need to have another transformer for that (or a custom job with more secondaries)?
#51
Preamps and Effects / Re: Hiwatt-based preamp
August 17, 2006, 12:28:22 PM
Cool. Keep me posted on the progress... I think as a stompbox a tone stack is not so important, but as a preamp it's very important... So, if you get around to adding it back in, let me know!! When I have some more time I'll look into myself... Thanks.
#52
Preamps and Effects / Re: Hiwatt-based preamp
August 17, 2006, 10:44:41 AM
Wait... just noticed that you went with a tone control instead of a full tone stack (treb, mid, bass)... was that just to make it simpler?
#53
Preamps and Effects / Re: Hiwatt-based preamp
August 17, 2006, 10:41:24 AM
Great! You've made me very excited... I'll probably want to figure out a 18vdc supply for this somewhere along the way, but 9v will be easy to start with. Thanks for all your effort!

Now I need to order more parts.

Also looking foward to seeing and hearing it some more.
#54
Yes, actually, clears it up for me. Thanks!

#55
Amplifier Discussion / Re: Stereo to mono power amp
August 17, 2006, 10:35:03 AM
Thanks. I'm still trying to wrap my brain around the differences between bridged and parallel... and the effects on the load.

If I parallel the amps, and I have a 4 ohm speaker hooked up to it, it sees the load as 8 ohms? If bridged it would be a 2 ohm load? I'm probably confusing my terms, but I'm trying to get it straight in my head.

The other question is, how do you bridge amps? and what are the advantages or disadvantages (compared with parallel)?

As I said, I'm probably way off in my thinking here, so thanks for your patience.. I'll try to find some literature online about bridged/parallel amps, too.
#56
Amplifier Discussion / Stereo to mono power amp
August 16, 2006, 06:00:17 PM
As I mentioned in another post, I'm planning to make a stereo guitar amp from the chipamp.com lm3886 kit. I'd like to have the option of going from stereo to mono if I'm using someone elses (mono) speaker cab at a gig, or if I decide to go with one preamp instead of two, etc. Can I simply install two switches? One at the input that would split one input into the two amps boards... and one at the output to combine the two outputs from the amp boards into one speaker out... bridging the two amps in parallel, right? Is there any problem with this? some sort of oscillation or overload or something?
#57
Preamps and Effects / Re: Hiwatt-based preamp
August 16, 2006, 05:15:05 PM
hmmm... I really like the idea of this preamp for a chipamp because the hiwatt power amp was pretty clean/hifi back in the day. That is, unlike marshalls and the like, there was less sag in the power amp. Should be able to make this into a good sounding solid state. My friend actually has two hiwatts (100 watt head and 4X12 cab and a very strange 100watt 2x12 combo - not too many of those were made) and this sounds way grainier and muddy to my ears. For me the defining tonal characteristic of his amps are how clean they sound. I'm not talking jazz amp clean, but clear and chimey... I think of it as just about as HiFi as you can get a big honking tube amp. If you think of pete and the who, his tones were never really that overdriven. I think the idea was to see how loud you could get a clean tone (with a little bite added). And, fyi, the presence knob on a hiwatt really adds a world of bite.

Anywho, I wish I knew more about electronics so I could help tweek this circuit, cause I'd really like to build one when it sounds good!
#58
Sorry about this everyone... I'm just knew to this world of ac. I'm (still) planning on putting together a stereo guitar amp based on the stereo lm3886 kit from chipamp (not the dual mono, but with one power supply). I'm hoping to get this kit for my b-day in a week and I'm planning ahead for what I'll have to buy. So, I'm looking at this transformer that RDV recommended:

http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=122-615

RG said this would be good to power two lm3886, which is what I want to do... but, now here's where the stupid question comes in, it has 22v + 22v secondaries... does that mean it has four secondaries of two pairs of 22v (each pair with a + and a -)? ...and ground. If I understand the schemo from the kit that's what I'd need, correct?

Also, unrelated question, if I'm planning to push 8ohm speakers I'd probably want something closer to 35v to get 50watts output, correct? Got that idea from the datasheet (http://www.national.com/pf/LM/LM3886.html).
#59
Buzzcocks are one of the founding fathers of pop punk. I'd say they're just good pop (maybe because I'm not into their imitators... see new wave and greenday/fat wreck chords/epitaph/lookout records/etc.).

Watch out for that rock music history... easy to lose track of imitation when you never knew the original innovation.

Ok. sorry. I'm done side-tracking the thread.
#60
Preamps and Effects / Re: I win! Marshall DRP1
April 24, 2006, 03:01:14 PM
Cool. Let us know how it sounds...