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Module ABS-Q+ for 4 tubes, PP & PPP amps, with a built in 6.3VAC AND bias supply, 115V or 230VAC powered transformer, fully autonomous.

Automatic optimize control bias system for triode output stages or pentode push-pull (PP) amplifiers

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abs-q+pr
abs-q+pr abs-q+top
pc
Manufacturer:TES
Price : 75,00 €
Availability:In stock

The model ABS-Q+ auto bias module is designed to optimize the bias for four triode or pentode output tubes in Push-Push (PP) or Parallel-Push-Pull (PPP) amplifiers that have their own negative bias supply circuit.  

Suitable for class A, AB, or B tube amplifiers. 
 
The ABS-Q+ dynamically controls the bias in four tubes. 
 
The module automatically optimizes the bias settings and maintains a strict symmetry of currents through both tube branches in the output stage. It will also stop any DC current flowing through the output transformers, all with the minimum of current loading on the anode of a tube.
DC current saturates an output transformer which results in increased low frequency distortions. 
 
The bias level is kept at the preset value irrespective of the input signal. 
 
This module is completely autonomous as it has its own bias and 6.3VAC power supplies. 

The ABS-Q+ will operate with the filament supply in your amp reference to ground, such as a center tap, since it comes with it own power transformer!

- PCB dimensions are 100mm x 80mm x 25mm high / 4" x 3.15" x 1" high
- completely autonomous, comes with its own bias and operating supplies!
 
INSTALLATION AND USER MANUAL FOR THE ABS-Q+MODULE 

Introduction:

This module has been designed to maintain a constant bias voltage through all power output tubes for your tube stereo power amp.

The bias is kept at a constant level on the output tubes, irrespective of the signal level. 

Benefits:

The advantage of using the ABS-Q+ module is that it will extend output tube life, in a lot of cases it will also improve the sound and last but not least, you will never have to worry about adjusting the bias again.

  • Instead of a pair of output tubes being biased together, now all output tubes are individually biased for greater control and stability
  • No need to keep an eye on and/or adjust the bias of the output tubes
  • Significant extension of the output tubes life
  • Bias is not influenced by the input signal
  • Undistorted and improved sound for a great listening experience
  • Reduction in hum and noise level of the amp
  • No maintenance or additional adjustments are required after the initial setup
  • Improved overall operation of the amp due to the reduction in the danger of a tube red plating
  • The ABS-Q+ ensures that bias is kept at the pre-set value (see Initial Setup) even as the tubes age
  • The ABS-Q+ comes with a soft start feature, which slowly brings up bias to each output tube
  • The ABS-Q+ comes with its own 6.3VAC AND bias supply power transformer, so this auto bias module is completely independent! 

Quick Overview:

The ABS-Q+ module has four blue LED’s, one for each output tube, which when lit, indicate that bias is at the correct level and that all is good with each tube.

Should any of these blue LED’s go out or not go on after power up, means that here is an issue with that given output tube and that the tube in question needs to be immediately replaced.

When the amp is powered up, at first a red LED will be on, indicating that there is power to the ABF-Q module. The red LED will go out after about 20s.

After a further delay of between 60-80s, each of the blue LED’s should come on indicating that the bias is now set and stable for each output tube. The amp is now ready to use.

The ABF-Q is suitable for class A, AB and C tube amplifies. 

Presetting the ABS-Q+ module bias level:

Before the ABS-Q+ module can be wired up, you need to preset its bias voltage.

As an example, for EL34 tubes, we recommend a bias voltage of 425mA, for KT88 tubes we recommend 450mV. You will need to consult the tube specifications in order to determine the optimal bias voltage for the tube in your amp.

This bias level is set using the blue colored trimmer on the ABS-Q+ module.

We strongly recommend that you preset the ABS-Q+ module before you proceed with installing it into your tube amp!

The ABS-Q+ has its own power transformer for the 6.3VAC supply as well as the -ve bias supply, so simply connect a pig tail power cord to the 115V mains terminals.

Place your ABS-Q+ module on a non-conductive surface. Apply power to the ABS-Q+ module and you should see the red LED on the ABS-Q+ module light up. This LED will go out after about 20s.

Set your meter to read DC and to the lowest scale, say 1V, 2V or 5V. Put the black meter lead on any GND pad on the ABS-Q+ module and put the red meter lead on the pad next to electrolytic capacitor, see below. Now adjust the blue trimmer until the desired bias level is achieved.

That’s it, you just set the ABS-Q+ module to the desired bias operating level. 

Example:
PP stage 2 x EL34, class AB1, ultra linear:
To set the bias for an EL34 tube, the recommended anode current for AB1 class is 42.5 mA. We therefore set the bias at 425 mV (0.425 V).



 

 

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