Enjoy the benefits of a premium membership!
Upgrade Account
-
TalkBass has been independent since 1998. Add your voice.
Create a free account to reply to discussions, view embedded media, and browse with fewer display ads.
Join free Log in
Want zero display ads or expanded classifieds tools? Compare plans.
Amp Guts Photos - Official Thread - Lets see those pics
- Thread starter svtb15
- Start date
My latest, Ampeg SVT-PRO 6.
- RMS Power Output (8 Ohms): 750-Watts.
- RMS Power Output (4 Ohms): 1100-Watts.
- Preamp: Tubes (2 x 12AX7)
- Driver Tubes: 2 x 12AU7, 2 x 12AX7.
- Power Amp: Solid State.
- Tone Controls: Bass and Treble.
- Mid Tone Control: 4-Band Semi-Parametric.
- Ultra Low/High Boosts: Yes
- Apr 3, 2003
- 35,516
- 19,953
- Disclosures
- Editor-in-Chief, Bass Gear Magazine
I think it was just a cosmetic revamping, Traynor is a brand own by Yorkville.Hey, that looks eerily similar to the Yorkville XS400H!And yeah, it sure does sound good. The tube drive is really versatile with the separate gain, drive and blend.
View attachment 3951048
Ha, the SVT-Pro 6... Did you had the fan issue?
Mine had a failed fan speed regulator and apparently it was a common unresolved issue.
Also, I kind of miss his power but I sold it because i found the EQ useless and the sound too dark.
A lot of grunge at the top right. That would drive me nuts.
Last edited:
Fan grunge was huge in the 90s...
So far no issues. Runs like a top and I've figured out the parametric EQ. Although I like the traditional Ampeg EQ setup better.
Power for miles for sure.
This amp is just...organized. 
DIY B15-esque build: early 60's Ampeg preamp into 12BH7 LTPI with 12au7 parallel FX loop mixing together at the PI input. Poweramp is two octals @~470-500V B+ into 50W Edcor ultralinear transformer. CLC filtering with little NOS 1H/350ma Thorardson L and some big cheap modern "C" for the B+ line. Switchable cathode/fixed bias on front panel; both modes are UL.
Gotta nail down the bias circuit (white prototype terminal strip), maybe shift over the input tube and add a hiwatt-style DC driver for the LTP...
..yes, it is "backwards": chassis used to be a hanging-mount Peavey Pacer, and hosted another DIY amp that was re-gutted for this build, so I had to kinda work with the sockets and layout.
Gotta nail down the bias circuit (white prototype terminal strip), maybe shift over the input tube and add a hiwatt-style DC driver for the LTP...
..yes, it is "backwards": chassis used to be a hanging-mount Peavey Pacer, and hosted another DIY amp that was re-gutted for this build, so I had to kinda work with the sockets and layout.
Last edited:
Just aquired this Tech 21 VT Bass 500 used so guess what? We all want to to peek inside. Very clean layout and looks to be easy to service should it ever be needed.
Don't know why I'm so fascinated by this stuff. The IRS2092 is a Class-D amplifier controller. The other 14- and 8-pin chips are probably op amps.
Semiconductor & System Solutions - Infineon Technologies
It's fun to skim through the datasheet for a component like this, just to see how much sophistication goes into these amps. But also, the sheer amount of additional circuitry shows that a lot of design intelligence is required of the person who uses one of these chips to make an amp that actually works well.
Also, the size of the heat sink shows that these things are efficient, but not 100% efficient. Providing even a wee bit of thermal mass and air circulation can mean the difference between running forever, and burning up on the launch pad.
Semiconductor & System Solutions - Infineon Technologies
It's fun to skim through the datasheet for a component like this, just to see how much sophistication goes into these amps. But also, the sheer amount of additional circuitry shows that a lot of design intelligence is required of the person who uses one of these chips to make an amp that actually works well.
Also, the size of the heat sink shows that these things are efficient, but not 100% efficient. Providing even a wee bit of thermal mass and air circulation can mean the difference between running forever, and burning up on the launch pad.
I'll do the comic relief.... Peavey Minx 110.
100% serviceable, from simpler days.
100% serviceable, from simpler days.
There's a lot to be said for simplicity. Right on.
