Super Twin Plexi
Model No. STP-50/100
Words cannot adequately describe this tone monster. Maybe "heart pounding" or "mind bending" come close! You have to feel the sound and well as hear it to undertand what it does to your mind...
The FRENZEL STP 50/100 "Super Twin Plexi" was designed as the ultimate amp for the serious player. It has a lot of soul that is generated by two separately voiced preamps each with its own separate Gain control, 3 band tone stack, and Master level control. One preamp is voiced like the classic Fender 5F8A Twin…the other the Marshall SLP Plexi. This amp is a unique one of a kind designed totally for the creative player in mind. It will give you just about any sound you ever dreamed of.
The heart of any amp is the preamp…it generates the signature tones. The preamp in this amp is a killer tone machine like none you have ever heard. It has separate input jacks for each channel. This allows you to use an AB-Y switch select either channel or both to create your own unique tones! Each channel has separate F and M preamps each with its own Gain Control, 3 Band Tone Stack, and Master Level Control. Both preamps share the same Presence control which is part of the output circuitry. Also, we have put an Edge pull-switch on the Presence control that sets the negative feedback level to produce a boost in volume and a soaring uncompressed sound for dynamic leads. The combination of all these options generates a wide ranges of tones from Clapton warm to Van Halen hot!
We left the output stage design of the amp pretty much undisturbed from the vintage design except we replaced the 5881’s used in the Twin with the new higher plate voltage JJ 6L6GC'S to give more headroom and warmth. For the output trannie we chose a vintage Marshall for the original classic vintage sound. This trannie provides you with extended low-end warmth and those incredible enhanced Marshall overtones. All the while, maintaining a perfect balance between the highs, mids, and lows. The trannie has 4, 8, and 16 ohm output taps which are selectable by a switch on the back of the amp. Two speaker jacks are provided for multiple speaker cabs.
For the power supply section we used an oversized custom power transformer. which provides great voltage regulation so that you don’t sag too much when you get on it hard. The high-voltage is filtered for very low hum by an equally large choke and 8 filter capacitors. We stayed with the Marshall choice of solid state rectifiers, but chose the newest type FRED ultra fast recovery rectifiers for tight dynamic bass response.
The amp is built on a compact 17” x 10” x 3” aluminum chassis and come with a retro steel mesh cage. All the parts in the amp are top-of-the line including polypropylene coupling caps, precision mica tone stack caps, metal film resistors, Alpha pots, Neutrik jacks, high voltage sockets, etc… This is a rock solid point-to-point hand wired amp….a real one of kind collectors item...designed to last for generations!
Input Jacks isolated from chassis for low noise, eddy currents, and hum.
DC on preamp and driver filaments for low noise and hum.
Star ground system to reduce induced current chassis noise.
Separate Gain, Tone Stack and Master controls for each channel.
Channel 1 - Fender Twin smooth warm clean tones. Channel 2 - Marshall Plexi high-mid overdrive tones....or you can use an AB-Y switch and create your own distinct tones.
Classic 60's vintage Bass, Mid, Treble 3-BAND TONE STACKS for extended flexibility in shaping your tone....plus Bright capacitor on Gain Controls for extra sparkle!
MASTER level controls so you can crank the GAIN's up and overdrive the preamps and drivers without overdriving the output tubes.
Classic vintage style Presence control .
EFFECTS LOOP - pure tube buffered serial effects loop designed to perfectly match the low impedance solid-state pedal levels with high impedance tube levels.
Unique NNFB "Edge" switch on the PRESENCE control that transforms the power amp section into a No-Negative-FeedBack style amp for more open, less compressed tones.
Line Out - post output transformer LINE OUT with LINE OUT LEVEL control for recording or driving a power amp, Auto switched internal load to simulate speaker if speaker is not plugged in. Inject great tone directly into the PA system with the Speaker Simulated Direct Interface.
Class AB matched pair of high power 6L6GC's for the pure vintage sound reproduction.
EL34/6L6 Bias Selector Switch - Allows you to use either 6L6 or EL34 power output tubes.
Power Output - 50 watts (100 Watt upgrade available with Quad of high power 6L6GC's)
Power Level Selector Switch - provides three power levels. 1/4 - 1/2 - FULL power.
Speaker Impedance Selector 4 - 8 - 16 ohms
Solid-State FRED ultra fast recovery rectifiers for tight dynamic bass response.
IEC PLUG-IN three prong grounded power cord.
STANDBY switch to turn off the high voltage during warm-up to protect the tubes.
Rock solid point-to-point hand wiring using only the best of parts...low noise tubular polypropylenes caps, metal film resistors, ceramic sockets, switchcraft jacks...etc.
Sweet vintage clean to classic overdrive tones with three different types of distortion depending on whether you are overdriving the preamp, output... or both!
Retro Vintage Cage - heavy duty steel mesh cage provides protection and excellent ventilation for tubes. Includes Fender style strap handle with nickel plated end caps.
Dimensions: : 17"W x 10"H x 12"D
Weight: 25 lbs.
Tube complement: 5 - 12AX7, 4 - 6L6GC
- CHANNEL 1 INPUT
- CHANNEL 1 GAIN
- CHANNEL 2 INPUT
- CHANNEL 2 GAIN
- PRESENCE with NNFB PULL SWITCH
- STANDBY SWITCH
- PILOT LIGHT
- POWER SWITCH
- POWER CORD
- POWER PRIMARY FUSE
- 6L6/EL34 BIAS SWITCH (On top of chassis next to power tubes)
- EFFECTS LOOP SEND
- EFFECTS LOOP RETURN
- POWER LEVEL SWITCH
- LINE OUT LEVEL
- LINE OUT JACK
- SPEAKER JACK
- SPEAKER IMPEDANCE SWITCH 4 - 8 - 16 OHM
These options allow you to customize your amp to meet your special individual requirements.
1. SUPER 100 QUAD OF 6L6GC'S - Four 6L6's in place of the pair of 6L6's for 100 watts of "audio dynamite". Add
2. EDGE FOOTSWITCH - adds jack to rear panel for footswitch control on the NNFB EDGE switch. Includes classic heavy duty footswitch with LED. Add $60.00
3. EFFECTS LOOP FOOTSWITCH - adds jack to rear panel for footswitch control of the EFFECTS LOOP bypass switch. Includes classic heavy duty footswitch with LED. Add $60.00
4. 100 - 240 VOLT POWER TRANSFORMER - for operation outside the USA. Please specify line voltage. Add $75.00
STP-50 - Dear Jim, I just absolutely love this amp. It has such a pure tone, even when I put a small chain in front or in the loop . I still prefer nothing in front or in the loop, but I have found, surprisingly, that I can pretty easily get into high gain territory on both channels with a boost. Matt C..(Missouri)
STP-100 - Jim, I got my amp and it is awesome!!! Thank you!!! Mark H. (Utah)
STP-100 - Great amp! I checked the amp on the bench instruments and on speakers. It puts out a solid clean 100 watts RMS, and that sounds like 200 watts through a pair of 12" Vintage Jensen C12N's. It will rattle the windows. If you like playing clean you will love this amp…but it will also kick and crunch and sing when you crank it up. The sound is clean and crisp and develops three distinct types of crunch and distortion depending on whether you are overdriving the preamp tubes, output tubes, or both. It will give you the great high mids of the SLP Plexi and the warmth of the Twin….plus a lot more! Gus M. (Texas)
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