SPX-3030 "Stereo Power Amp"

STS-88 'Super Twin Stereo
SPX-3030 "Stereo Power Amp"

  



 

 

  





Rack Mount Chassis Panel


Installed In 4U Metal Rack Cab With Vent Panel

 
 Stereo Power Amp 3030


Model No. SPX-3030



Stereo Class AB ultra-linear audio reproduction  for crystal clear fidelity. 
 

Price: MSRP................. $1595.00 

Sale Price....... $995.00


 


Overview

The  FRENZEL SPX- 3030  Rack Mount 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 rectifier 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 Push-Pull 6L6 design with cathode bias for each channel. This design allows the use of many of the octal base output tubes including the 6V6, 6L6, 5881, 6550, KT66 & KT88 without adjusting the bias.  It will give crystal clear tones and will faithfully reproduce what you put into it. The amp is designed to mount in a 19" rack and comes standard as an open chassis amp with a 2U rack mount panel and 2U vent panel.


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. 

Post output transformer LINE OUT with LINE OUT LEVEL control for driving a higher power amp, or for using this amp as a tube preamp/overdrive or recording,  Auto switching internal load if speaker is not connected to give you loaded output distortion.  
  
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. 

Rackmount 2U front panel with 2U vent panel. (Please note that rack rails or a rack shelf is required to support the weight of the amp.)
 
Tube compliment: The amp comes with 4 - 12AX7,  4 – 6L6GC, 1 - 5AR4

FRONT PANEL:

Channel 1 Controls

- LINE OUT LEVEL
- INPUT LEVEL
- PRESENCE with NNFB PULL SWITCH

Power Controls

-STANDBY SWITCH
- PILOT LIGHT
- POWER SWITCH

Channel 2 Controls

- LINE OUT LEVEL
- INPUT LEVEL
- PRESENCE with NNFB PULL SWITCH

REAR PANEL:

Channel 1 Controls

- IMPEDANCE SELECTOR
- SPEAKER OUT JACK
- LINE OUT JACK
- INPUT JACK

Power Section

- POWER CORD CONNECTOR
- FUSE

Channel 2 Controls

- IMPEDANCE SELECTOR
- SPEAKER OUT JACK
- LINE OUT JACK
- INPUT JACK

SPECIFICATIONS:

- Frequency Response: 20 to 20,000 hz
- Harmonic Distortion: Less than 1% 
- Input Impedance:   1 meg
- Output Impedance: Selectable 4 - 8 - 16 ohm 
- Input Level:  1.0 V RMS for full output
- Output Power: 30 watts per channel
Preamp Tubes: 4 – 12AX7 (input driver/buffer) 
Power Amp Tubes: 4 – 6L6 (2 per channel)
USA Model: 120VAC, 300VA, Export Model: 230VAC, 300VA
- Rack Space Dimensions: 19” Wide x 10” Deep X  4U High
- Net Weight: 25  lbs 




Upgrade Options

These options allow you to  customize your amp to meet your special individual requirements.

1.  POWER ATTENUATOR - Built-in power attenuators on both channels provides three power levels. 1/4 - 1/2 - FULL  Add $150.00

2. 100 - 240 VOLT POWER TRANSFORMER - for operation outside the USA. Please specify line voltage. Add $75.00

3.
 SOLID-STATE PLUG-IN RECTIFIER - Use this solid state plug-in rectifier replacement for 5AR4 rectifier tube when less sag and a more dynamic  response is desired.  Just switch back to the tube rectifier when sag is desired.  Add $12.00  

4. DUAL RECTIFER MODE SWITCH - Provides a switch to select between a 5AR4 rectifier for smooth compression on peaks or a FRED  high voltage solid-state rectifier for sharp pick attack and dynamic bass.  $50.00   

5.  SPX-1515  15 WATT MODEL -  Uses  6V6's in place of 6L6's for 15 watts of power.  Deduct $100.00

6. HEAD CAB - 4U Rack Mount Head Cab.  Add $195.00  



Reviews


Dear Jim,  I like the sound of the amp together with my single driver fullrange 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)

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 - Use this link to listen to Tom's amazing guitars. https://curneenguitars.com/audio/

For more reviews please check our Customers Reviews page.  


 



 

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