Antique Sound Lab Hurricane 200DT
Reference Upgrade
by Response Audio

Now includes the Monsoon MKII Amplifiers

Response Audio has introduced the Reference Series upgrade for the Antique Sound Lab 200 watt tube mono bloc amplifiers.

After performing Extreme upgrades to nearly 45 pair of Hurricanes and dozens of Signature Hurricanes, we were continuously asked to come out with an upgrade falling somewhere in between. To make things much simpler, we now have all the upgrade options on this one page.

Like the Extreme Hurricanes, the Reference upgrade addresses every aspect of these amplifiers. The power supply, input and phase splitter circuit as well as the main output circuitry are all gone through thoroughly.

What's Included

** Coupling capacitors installed in the signal path coupling stages (x16 pieces) as well as the innerstage coupling caps in the input circuit (x4 pieces). The capacitors are mounted using a high quality double sided adhesive tape as well as being secured with zip-ties to eliminated vibration.

** Various capacitors are available depending on your personal preference.

• VH Audio V-Cap TFTF or CUTF

• Clarity Cap MR Series (Minimal Resonance) capacitors

• Mundorf Silver/Oil/Gold

• Mundorf Silver/Oil
  
  ** Dale/Vishay 3W resistors are used for the grid stop applications. x16 pieces
  All grid stop resistors are mounted directly to the grid pin of each power tube eliminating all unnecessary wiring. It is a common practice to mount the body of grid stopper resistors as close to the tube grid as possible. Many tube amp manufacturers do not utilize this practice. All grid stop resistors are then mounted directly to the leads of the coupling capacitors and all leads are cut to minimum length.
  
  ** Dale/Vishay resistors are used for the screen grid applications. x16 pieces
  
  ** High quality 5 watt Mills non-inductive resistors used in cathode ground locations of all power tubes  x16 pieces
  
  ** Dale/Vishay 1 watt 1% non-magnetic resistors used throughout the signal path. The signal leads of these resistors are shortened to the shortest lengths possible and all exposed leads are covered with heat shrink to help eliminate vibration and protect against shorts.
  
  ** Dale/Vishay 1 watt, 1% resistors are used in the bias stage in series with the coupling capacitors. These resistors are mounted in series with the coupling capacitors and then into the bias stage circuit boards. Again, we keep all signal wiring as short as possible.
  
  ** All exposed resistor leads throughout these amplifiers have heatshrink applied to help reduce mechanical vibration as well as preventing circuit shorts.
  
  ** The grounding layout is reworked to provide a the best possible results with a dead quite background and lower noise floor.
  
  ** All power supply capacitors are bypassed with Clarity Cap SA Series capacitors. Each power supply filter capacitor receives its own bypass unit. Total of 8  bypass capacitors depending on model
  
  ** Fairchild "Ultra Fast - Soft Recovery" diodes are utilized in the rectifying stage of the power supply. The diodes are mounted directly to the capacitors of the power supply.
  
  ** High quality solid core shielded internal signal wire. x8 feet
  We also apply a full shield to this wire to also further reduce any possible noise.
  
  ** RCA input jacks are high quality silver Cardas RCA jacks.
  
  ** RoHS compliant silver solder used throughout
  
  ** Bench tested for 2 hours
  
  ** Minimum 12 hour burn in
  
  ** Labor : 16+ hours per pair
  
  ** Pricing: does not include shipping to and from our New York facility.

Price:  Hurricane MKI and Monsoon MKII amplifiers

• NOTE: We will no longer provide upgrade services for the "vertical stacked" MK II Hurricanes.

Ordering

Please contact us to discuss turnaround times which are based on our current work load.

A 60% down payment is required at time of order with the balance due prior to shipping.

Quick Start Manual - We have put together a quick manual to better help you install and bias the output tubes in your ASL Hurricane amplifiers.

This process will also help aid you in diagnosing a bad tube.