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July 17, 2024, 04:48:01 PM

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#11
Amplifier Discussion / Re: Transformer mounting orien...
Last post by J M Fahey - July 07, 2024, 12:39:15 AM
1) agree that in SS amps, supply voltages often match or at least are real close if power is about same (here 65 W) and supposing speaker impedance is same (8 ohm?.so power transformers should be more or less interchangeable.
Only problems come, sometimes, if main winding voltages match but some get preamp voltage out of main rails, by attenuating those using Zeners or regulators (as in Fender, Laney, Marshall, etc.), while Asian ones add extra 2 x 15-20 VAC secondaries.
So if you need those you _might_ have to buy an extra small transformer for that.
Often happens with popular Antek toroids.
#12
Preamps and Effects / Re: Joe Davisson's Vulcan prea...
Last post by Miyagi_83 - June 26, 2024, 03:56:17 AM
Here's the schematic for the iteration presented in reply #24. I plugged the output straight into the high-impedance input of a tube amp. The cable's capacitance is 530 pF according to my DMM.
#13
Honey Amp / Re: Just got the kit this week...
Last post by joecool85 - June 25, 2024, 03:14:41 PM
Quote from: RookieRecurve on June 25, 2024, 12:54:31 AMHopefully this isn't a zombie post.  You said you burnt up components using a laptop charger.  Was it too much voltage, or was it an issue with current?

Regarding the excess gain from the 1-8 jumper, what cap did you use?  I might dabble with this option once I get my kit, and put it together.

Most laptop chargers are 19v or 20v, either is way too much for this kit.  Max voltage is 16v.  Recommended voltages depend on what the speaker load is.

4 ohm : 6-9v DC
8 ohm : 6-12v DC
16 ohm : 6-16v DC


This yields this power output:

4 ohms = Max 0.35w (clean 0.25w) @ 6v supply, Min 0.35w @ 6v
8 ohms = Max 0.85w (clean 0.5w) @ 12v supply, Min 0.3w @ 6v
16 ohms = Max 1.6w (clean 1.2w) @ 16v supply, Min 0.2w @ 6v
#14
Guitar News / Boss Katana - Gen 3 Released
Last post by joecool85 - June 25, 2024, 03:08:07 PM
Last month Boss released the new Gen 3 version of the ever-popular Katana amp series.  Consisting of general model updates, this seems like a decent amp still but nothing to toss your old Gen 2 model out for.

https://www.gearnews.com/boss-katana-gen-3-amp-series-enhanced-tube-logic-tone/
#15
Honey Amp / Re: Just got the kit this week...
Last post by RookieRecurve - June 25, 2024, 12:54:31 AM
Hopefully this isn't a zombie post.  You said you burnt up components using a laptop charger.  Was it too much voltage, or was it an issue with current?

Regarding the excess gain from the 1-8 jumper, what cap did you use?  I might dabble with this option once I get my kit, and put it together.
#16
Amplifier Discussion / Re: Repairing a Gibson G-105 G...
Last post by phatt - June 22, 2024, 06:13:19 PM
Great to hear you fixed it. Good work G1  8)
Phil.
#17
Amplifier Discussion / Re: Repairing a Gibson G-105 G...
Last post by Timko - June 20, 2024, 01:50:44 PM
I ended up running to my electronics store (yay big city living), picking up a pack of 2.7k 1/2 watt resistors, and getting them into the amp.  It works like a champ now!  Thank you so much for the help and direction.
#18
Preamps and Effects / Re: Joe Davisson's Vulcan prea...
Last post by Miyagi_83 - June 20, 2024, 11:20:12 AM
No problem. I breadboarded it to see how it sounds and shared my findings for others to have a point of reference because I had trouble finding any. Maybe my recordings will not get lost over time.
NB: I plugged the output of the preamp directly into the effects loop return of my DIY tube amp for this recording. Later I ran it through a buffer (a bypassed Boss DS-1) and it sounds different than in the sound sample.
EDIT: Of course, I can post the schematic if anyone's interested.
#19
Schematics and Layouts / Re: Ibanez TSA30 Schematic and...
Last post by Frank75 - June 19, 2024, 05:59:56 PM
I was on the road for a while, so today was my first opportunity to open up the amp and take a peak. What a mess. Some of the soldering looks like it's been done by a 5yr old. The tube sockets are mounted on stilts.
Anyway, visual inspection didn't really bring any results. I took a few measurements and these put the biasing VR on the suspect list. I can't get a steady reading from it. There's also a crack in the PCB near the VR, although I don't see an immediate correlation there.
All 9-pin sockets feel a bit loose, but I suppose that's just wiggle room. ::)
Respect for those in this thread who opened this soab and lived to tell the tale.
#20
Preamps and Effects / Re: Joe Davisson's Vulcan prea...
Last post by joecool85 - June 19, 2024, 11:14:13 AM
Quote from: Miyagi_83 on June 12, 2024, 04:57:39 AMI added another gain stage and tweaked it again. Here's how it sounds now

https://m.soundcloud.com/user-996907905/joe_davisson_preamp_modded_bc3

EDIT: Again, I'd like to apologize for the sloppy playing.

Sounds great!  Thanks for sharing!