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12GT5-guitar amp.
12GT5-guitar amp.
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Old 26th April 2010, 07:58 PM   #1
davorin is online now davorin  Croatia
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Location: Zadar, Croatia
Default 12GT5-guitar amp.

Small, (~30W) and not expensive amplifier, but with "brand name" tubes. (12GT5-RCA)
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Old 27th April 2010, 12:12 PM   #2
Sal Brisindi is offline Sal Brisindi  United States
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Very nice job done on your Guitar amp.

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Old 27th April 2010, 04:03 PM   #3
firechief is offline firechief  United States
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Hi I see that you are getting away from the more conventional choices for guitar amp tubes, fun experiment! Have you tried using the effects send yet?
I wonder if coming off of the tone stack, and right out to the effects send is going to work well. Conventional wisdom usally says put a buffer just befor the send out. On the other hand it may work just fine. I dont want to rain on your parade, just an observation. Also is that a re-cycled chassis?
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Old 27th April 2010, 06:11 PM   #4
davorin is online now davorin  Croatia
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Join Date: Aug 2005
Location: Zadar, Croatia
Yes, chassis is from some HF-selector (HI!). I am not satisfied with quality of current tube production, conventional audio NOS tubes are very expensive, so I use non-conventional cheep tubes from the end of tubes evolution for my projects.
Maximum total distortion of this amplifier at is almost enough for punk or heavy-metal, and some pedal-effects works good at input (all I try). Line(effect) in/out work good with tube-reverb(diy), but I did not try any other effect here(in this amp.).
Maximum power is ~40W (very loud with only 320V-DC!), but clean power is ~30W.
This tubes (total cost ~16$) will work good next 5-10 years (maybe much more!), and current production of tubes cant work good 2-3 year!
HV-BIAS transformer is from old Sharp-B&W TV, heater transformer is for halogen 12V-light, CAN-elko is new, but cheep (for old TV-repair!) and 2x560uF are also new and cheep (for repair computer PS).
All other parts are new, but total cost is only ~80$ for very good guitar amplifier.
Many other cheep TV-sweep tubes can work here, maybe all with Pa>18. (with small modification: socket, anode cap, heater voltage and small bias correction)(Pa~18W is very conservative ratings; only for CCS as deflection tube! All that tubes can work with Pa22-25W in push-pull audio amplifier!).
Input, drive and PS tubes are cheep Russian military "Long-Life, SQ", but conventional 12AX7/ECC83 will work fine as input tubes, and 12AT7/ECC81 or 6AQ7/ECC85 for driver and PS (and 12AV7, 5965 or E180CC too!).
I was experimenting with very expensive "Müllard", "Brimar" and "Philips" small tubes, but sound was not much better with them.
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