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SPX-3030 Stereo Power Amp



  • Stereo Tube Power Amp

  • 30 Watts Per Channel

  • 4-8-16 Speaker Impedance

  • Volume Level Control

  • Presence Control With Edge Boost

  • Line Out Record Level Control

  • 6L6 - EL34 Bias Switch

  • Tubes: 4 -12AX7, 4-6L6


Retro Cage Chassis Model

MSRP: $1995.00



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Frenzel SPX3030 Rack Mount Stereo Tube Amplifier

4U Rack Mount Chassis Model

2U Control Panel - 2U Vent Panel


Frenzel SPX3030 Tube Stereo Power Amplifier

MSRP: $2095.00



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Reference Photo Only - Typical Install In 4U Rack Cabinet

Sample Image - Front Panel May Vary With Upgrades 



The  FRENZEL SPX- 3030 Stereo Power Amp  was designed for the tube purist to be used as a musical instrument power amp or as a home stereo power amp.  It uses an all tube circuitry in the amplifier section for those vintage warm tube tones with a solid-state ultra fast recovery rectifiers in the power supply for tight dynamic bass response. Two 12AX7/ECC83 tubes are used as preamp buffer drivers. The output uses a Class AB Linear Push-Pull design with fixed bias for each channel.  The amp comes standard with 6L6's.  A 6L6/EL34 bias switch allows the use of EL34's with no bias adjustment.  Heavy-duty linear transformers are used to give crystal clear tones. This amp will faithfully reproduce what you put into it. 

Standard Features:

  • Input Jacks isolated from chassis for low noise, eddy currents, and hum. 

  • Classic Chicken Head Knobs, Toggle Switches and Jewel Pilot Light 

  • DC on filaments for low 60 hz hum.  

  • Star ground system to reduce induced current chassis noise. 

  • Input Level Controls  for each channel

  • Classic Type 5F6A Style Presence control.  

  • 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. 

  • Heavy-Duty Linear High Performance Output transformers

  • EL34/6L6 Bias Selector Switch - Allows you to use either 6L6 or EL34 type power output tubes.

  • Solid-State FRED ultra fast recovery rectifiers for tight dynamic bass response. 

  • Post output transformer LINE OUT with LINE OUT LEVEL control for driving a another power amp, PA system or recording,  Auto switching internal load if speaker is not connected to protect amplifiers and to give you true loaded simulated speaker  output.

  • IEC detachable plug-in three prong grounded power cord. 

  • STANDBY switch to turn off the plate voltage during warm-up.   

  • Rock solid point-to-point hand wiring using only the best of parts...low noise tubular polypropylenes caps, metal film resistors, Micalex long-life sockets, premium Neutrik jacks...etc. 

  • Tube compliment:  4 - 12AX7,  4 – 6L6GC

Electrical Specifications: 

  • Input Power  - USA Model: 120VAC, 300VA, Export Model: 230VAC, 300VA. Standard IEC plug-in three prong grounded power cord. (100VAC & 240VAC export upgrade available. See Upgrade Options) 

  • Output Tubes - Class AB Push-Pull 6L6's - Fixed Bias

  • Output Power - 30 watts RMS per channel

  • Speaker Output Impedance4-8-16 ohms.

  • Line Out Impedance - 10K ohms

  • Input Impedance - 1 Megohm

  • Frequency Response: 20 to 20,000 hz

  • Harmonic Distortion: Less than 1%

  • Preamp Tubes: 4 – 12AX7 (input driver/buffer)

  • Power Amp Tubes: 4 – 6L6 (2 per channel)

Physical Data: 

  • Chassis - Heavy gauge aluminum with welded corners.

  • Retro Vintage Cage Head Model  - heavy duty lightweight steel mesh cage provides protection and excellent ventilation for tubes. Comes with easy carry Fender style strap handle. Overall  Dimensions - 17" Wide x 12" Deep x 10" High (Includes feet, handle and knobs)
  • Rack Mount Chassis Model -  2U rackmount control panel with 2U vent panel
  • Weight -  22 lbs. 

  • Rock solid point-to-point hand wiring with military style tie-wrapped wiring harnesses for long life and reliability.

  • DC on filaments to eliminate 60 hz hum.

  • Star ground system to eliminate induced current chassis noise.

  • Input and Output Jacks isolated from chassis for low noise, eddy currents, and hum.

  • Classic Pointer Control Knobs

  • Heavy Duty Toggle Switches

  • Vintage Glass Jewel Pilot Light

  • Components:  Only the highest quality parts are used including heavy duty transformers, low noise tubular polypropylenes capacitors, metal film resistors, Micalex sockets, Neutrik jacks. All parts are rated for commercial high use conditions. Wherever possible we use parts made in the USA.

  • Front Panel:  Input Jacks, Volume Level Controls,  Line Out Level Controls, Presence Controls With Edge Boost Switch, Standby Power Switch, Pilot Lamp, On/Off Power Switch

  • Rear Panel:   Power Cord Connector, Fuse, Line Out Jacks, Speaker Output Jacks.


Review  by Featured Artist & Master Guitar Builder Tom Curneen

From the fabulous custom guitar maker Tom Curneen..."Jim, Your stereo preamp FM800z, combined with the SPX-3030 power stereo amp, coming out of vintage Altec Lansing 12’s is so Sweet!!! Your amps have an aural shimmer. The soundfield is wonderful thanks to your build quality and character of sound. Thank you for building affordable classics. My stairway to heaven, you are." Tom Curneen 

Review  by Featured Artist Ralf S

Dear Jim,  I like the sound of the amp together with my single driver full range speakers very much. It is just the right amount of tube sound for longtime listening. The amp runs very cool compared to my SS-4772. The NNFB works fine with the SPX 15/15 because there is still enough bass. I tried different output tubes (6V6, KT66, KT88 and EL34) and the 6L6GC is in this amp the best because of the well balanced sound and the natural human voices.The SPX 1515 is now part of my home stereo system and I am very happy with the performance. Best Regards, Ralf S. (Germany)   


For more reviews please check our Customers Reviews page.  



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