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January 25, 2020, 06:37:35 AM

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1
Amplifier Discussion / Best way to tap power for 9v reverb?
« Last post by joecool85 on January 24, 2020, 08:27:26 PM »
I'm thinking about adding reverb to my K20-X and rather than build out the circuit as the K30RX (they share the same board), I'm thinking of using a Belton brick.  This would require 9v DC to supply it.  I'm leaning towards simply attaching a basic 7809 regulator to the positive line of the +/-18v PSU output.  I know that technically this would draw a few ma off that end of the PSU potentially making it unbalanced, but I can't image it would be an issue.  So, what do you guys think?
2
Schematics and Layouts / Re: guitar amp diagram revision help
« Last post by joecool85 on January 24, 2020, 08:07:30 PM »
BTW, X1 is NOT a buffer. As for distortion, just adding diodes won't work well, you would need to add an extra stage to get a reasonable outcome.
You could add an input buffer stage and alter X1 to work like the link *Joecool* noted above.

Also, I believe the TDA2050 is no longer made, though you could use LM1875, others here will know more.

The reality of this is that you it would work out a lot cheaper and many times easier to just purchase a small amp. xP
Phil.

TDA2050 is marked as obsolete anywhere I've looked.  You could probably source one on eBay though.  That said, LM1875 is a great chip and I think it is a direct replacement pinout wise (you'd want to double check).

I disagree on the just buying a small amp though, unless money is the most important aspect.  Building an amp is fun and a great learning experience - well worth the money involved.  That said, buying a kit could be a good way to go.  Or buy something like this 5w unit and then build an overdrive to sit in front of it: https://www.parts-express.com/footnote-electric-guitar-5-watt-amp-assembly-with-power-supply--249-404
3
As far as I can see these Nu-tubes are just a gimmick. You dont get a lot of gain from them so they are not going to have much effect to the signal.  Snake oil :)

I disagree. While I haven't played with one myself, I've listened to a bunch of clips of the Vox MV50 series, the AC in particular. It sounds fantastic! How much is the nutube and how much is the rest of the circuit if anyone's guess right now though.

This demo from 2017 shows the sound of the NuTube itself. It's indeed very tube-y:

https://www.youtube.com/watch?v=TXUYgi6GB3I
4
Schematics and Layouts / Re: Schematic sites for different brands of amps
« Last post by joecool85 on January 24, 2020, 08:01:15 PM »
Dean Markley's site is now down, but you can get to the archive of pdfs in archive.org: https://web.archive.org/web/20160410144729/http://deanmarkley.com/Info/LegacyAmps/Docs.shtml
5
Schematics and Layouts / Re: guitar amp diagram revision help
« Last post by phatt on January 24, 2020, 07:39:05 PM »
BTW, X1 is NOT a buffer. As for distortion, just adding diodes won't work well, you would need to add an extra stage to get a reasonable outcome.
You could add an input buffer stage and alter X1 to work like the link *Joecool* noted above.

Also, I believe the TDA2050 is no longer made, though you could use LM1875, others here will know more.

The reality of this is that you it would work out a lot cheaper and many times easier to just purchase a small amp. xP
Phil.
6
Guitar News / Mooer digital amps in the marketplace - Mooer SD series
« Last post by joecool85 on January 23, 2020, 07:54:02 PM »
Mooer Audio has released a new line of amps, the SD series.  They are bluetooth equipped digital solid state amps.  Boasting 40 preset slots and 25 amp models along with 30 or 75w of solid state power, these amps should shine at small gigs and rehearsal spaces as well as in the bedroom for solo practice.

https://www.musicradar.com/news/namm-2020-small-compact-digital-and-with-a-tube-like-performance-mooer-audio-unveils-the-sd-amplifier-series
7
Tubes and Hybrids / Re: transformer replacement
« Last post by joecool85 on January 23, 2020, 11:34:06 AM »
I had a guy check it out who works on mostly vintage amps.  Said no power on other side of transformer.  I know nothing about them  Where would I go to find the parts you are talking about?

First, are you connecting to 115v or 230v?  Next, go to jameco.com, or mouser.com and start looking for transformers.  Let us know what you are connecting to and we should be able to help you find something.
8
Schematics and Layouts / Re: guitar amp diagram revision help
« Last post by joecool85 on January 23, 2020, 11:30:46 AM »
Thanks for your answer. I think it would be better to add 'internal' overdrive as in Marshall amplifiers. For this, if I add 2 reverse diodes to the first buffer, will it work? I draw the scheme as a pcb and now I have to make all additions, I have no chance to add it later.

If you were to modify the preamp section to be similar to one with overdrive, that should work.  Here is one that is easy to work with: https://www.ssguitar.com/index.php?topic=1885.0
9
Tubes and Hybrids / Re: transformer replacement
« Last post by monco man on January 22, 2020, 05:35:36 PM »
I had a guy check it out who works on mostly vintage amps.  Said no power on other side of transformer.  I know nothing about them  Where would I go to find the parts you are talking about?
10
Schematics and Layouts / Re: guitar amp diagram revision help
« Last post by watermelon33 on January 22, 2020, 12:35:14 PM »
Thanks for your answer. I think it would be better to add 'internal' overdrive as in Marshall amplifiers. For this, if I add 2 reverse diodes to the first buffer, will it work? I draw the scheme as a pcb and now I have to make all additions, I have no chance to add it later.
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