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Antique Sound Labs HURRICANE 200 DT Tube Amp Pair Modified By Response Audio ASL


Item History and Pricing
Information:
Model: 200 DT HurricaneBrand: Antique Sound Labs
UPC: Does not apply
Original Description:
HTML Style Sheet   Antique Sound Labs HURRICANE DT200 Tube Amp Pair - Modified by Response Audio - Signature Plus ASL Hurricane 200 DT Description Awarded “Best Tube Amplifier Of The Year”.

Frequency responsible  at 1 W: 12Hz - 74KHz
Frequency responsible at full power: 20Hz - 20KHz
Power output: 200W
Distortion at 10W: <0.3%
... Distortion at full: <3%
S/N Ratio / Noise level mV: 86 db
S/N Ratio with A weighting: 93db
Input impedance: 100K
Output Impedance: 4,8,16 Ohm
Input sensitive: 1.7V
Power request: 610W
Fuse : 10A Slow blow
Tube Complement     KT88 x 8, 6SN7 x 3
Response Audio of New York is well known for their modifications to the ASL DT200 Hurricane Amps. Modification Upgrades Performed on the Signature Plus Hurricanes

    Audience AuriCap installed in the signal path coupling stages. Original capacitors are removed from their mounting plate and the new coupling capacitors are mounted using a high quality double sided adhesive tape as well as being secured with zip-ties to eliminated vibration. Total of 20 pieces

    Bybee Quantum Purifiers in B+ Voltage between mains transformer and rectifying bridge - 4 pieces per pair. These pieces are mounted direct to the rectifying bridges eliminating all wiring between the Bybee Purifiers and circuit boards. The wiring from the mains transformer to the Bybee Purifiers is then shortened to a maximum of 3 inches. Optional - See pricing below

    SoniCap high voltage capacitors used as bypass units in the power supply being used  before and after the power supply filter choke. Each power supply filter capacitor receives its own  bypass capacitor.  Total of 8 bypass capacitors.

    Japanese Riken Ohm  1% carbon film resistors, 16 pieces, are used for the grid stop applications. All grid stopper resistors are mounted directly to the grid pin of each power tube eliminating all unnecessary wiring. All grid stop resistors are then mounted directly to the leads of the coupling capacitors and all leads are cut to minimum length with any exposed lengths covered with a heavy heat shrink to isolate and protect the circuit and provide adequate damping of the lead material to prevent mechanical vibration. In this process, almost 3 feet of unnecessary wiring (between grid stop resistor and tube socket) is eliminated.

    Japanese Riken Ohm 1% carbon film resistors, 16 pieces, are used at the screen grids for triode mode operation. These units are direct wired eliminating as much circuit wiring as possible. We also apply the same protection and damping techniques as with the grid stopper resistors.

    High quality 5 watt, 1% Mills non-inductive resistors used in cathode location on 6SN7 and power tubes. These resistors are mounted directly to the cathode pin of each tube.
    x24 pieces

    Dale/Vishay 1 watt 1% non-magnetic resistors used throughout the signal path. 60+ pieces. The signal leads of these resistors are shortened to the shortest lengths possible. We have chosen 1 watt units in place of the 1/2 watt pieces that come stock in these pieces for several reasons.
     1) Utilizing higher wattage units with a larger physical size provides a quieter presentation.
     2) The use of the high quality Dale/Vishay Metal Film pieces also aid in a quieter presentation as well as providing better matching within the circuitry. Dale/Vishay resistors offer a 1% tolerance. We still measure all resistors for accuracy before installation into any of our modifications.
     3) We have found the quality of the stock resistors is inferior to those use in our modifications and in many instances, we have found broken leads going into the bodies of the resistors which have caused many of the symptoms mentioned above.

    Dale/Vishay 1 watt, 1% resistors are used in the bias stage between the tube grid and bias stage. These resistors are mounted in series with the coupling capacitors and then into the bias stage circuit boards. Again, we shorten all signal wiring to the shortest possible lengths and utilize the Dale/Vishay units for the many reasons as mentioned above. In this process, approximately 3.5 feet of unnecessary wiring is eliminated.

    During the modification, we also go through and check all internal solder connections looking for and resoldering any "cold" or "dry" looking joints to prevent any future problems. All tube socket and ground plane connections are resoldered by removing all solder and applying new WBT 4% silver solder.

    Dale/Vishay 3 watt 1%, non-magnetic wirewound resistors are utilized throughout various power supply locations.

    As mentioned above, all exposed resistor leads throughout these amplifiers have heatshrink applied to help reduce mechanical vibration as well as preventing circuit shorts and RFI interference. We have found that an excessive number of long, exposed leads can actually act in a similar manner as a radio antenna pulling in "Radio Frequency Interference"

    Fairchild "Ultra Fast - Soft Recovery" 8A/1000v diodes are utilized in the main rectifying stage of the power supply. These diodes replace the very inexpensive silicon units that come standard in the stock amplifiers.

    Internal wiring is replaced with our custom 22 awg shielded copper wiring. We do not use the shield as the ground. Total length of wire used within a pair of Hurricanes is over 7 feet.
    OPTIONAL - 24 awg solid Silver/Teflon dielectric, custom shielded internal signal wiring.  We do NOT use the shield as a ground. 

    The bottom plate of both units are covered with an odorless, heavy asphalt based damping material to help prevent further vibration. The chassis of these products is machined from thick aluminum and does not require any damping techniques.

    RA Jacks are replaced with high quality gold-plated RCA sockets with Teflon insulation lining. Shown below

    WBT style speaker binding post are installed at the common, 4 ohm and 8 ohm taps. Total of 6 pieces Also shown below.

    WBT Silver solder used throughout

    Each unit is "scoped" and bench tested for 2 hours

    Minimum 12 hour burn in (standard 24 hours) in a full system.

    Labor - 15+ hours per pair depending on options

    Recommended break-in period - 100 hrs (60%) / 200 hrs. (80%) / 300+ hrs. (95%)

This pair has a number of optional upgrades to the Signature Plus modification, please refer to 2 page invoice in the photos. The Signature Plus modifications cost $1,995. Optional upgrades added $1,736 for a total of $3,731. Optional upgrades:
Bybee Quantum Purifiers Custom Red powder coated paint New solid silver internal signal wiring New Penta Teflon bypass capacitors Furutech Gold IEC power connectors WBT speaker binding posts
Dimensions: 12.5"W x 20.5"D x 7.5"H. Weight: 64 lbs each
Produced 2005. Retail $4,995 per pair plus $3,731 Signature Plus modifications by Response Audio. Both the amps and the modifications are much more expensive today.
Condition Serial #030001015824 and 03000101015860, Antique Sound Labs 200 DT with Signature Plus Upgrade by Response Audio.
Units are in EXCELLENT condition, show very minor wear and tear. One amp has a bend in the rear panel at the speaker connectors.
Units are in EXCELLENT working condition and sound great. All tubes test STRONG on calibrated TV7au and Maxi-Matcher. Two of the output tubes have broken center guide pins. They have been glued but will probably break again. Does not affect operation.
The Response Audio modification were done in 2005. The amps were never placed in service. We checked them out, brought them up on a Variac, set the bias, and ran them for a week. They probably still have a bit more break in period. Includes Owners Manual.
Terms
Buyer to prepay for  and packing/shipping/insurance. PLEASE NOTE: This will ship as three cartons - two for the amps and one for the tubes. Please wait for a revised invoice including all of the shipping. The automatic eBay invoice will only show the shipping for one amp.
Local pick up is welcome. Sales tax applicable for Arizona buyers. Actual unit in photos. Sold as is, with no further guarantee. InternationalBuyers – Please Note: Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyer's responsibility. Please check with your country's customs office to determine what these additional costs will be prior to bidding/buying. These charges are normally collected by the delivering freight (shipping) company or when you pick the item up – do not confuse them for additional shipping charges. We do not mark merchandise values below value or mark items as "gifts" - US and International government regulations prohibit such behavior. THANKS! Copyright 2019 Text and Images, All Rights Reserved
Contact us to sell your valuable items on eBay! This item may be viewed at:
AUDIO VIDEO CHOICES, Inc.
601 E Indian School Rd, Suite 200
Phoenix, AZ 85012
Open Tues - Fri 10am-6pm, Sat Noon-4pm
(Closed Sun+Mon)

On Aug-10-19 at 09:24:26 PDT, seller added the following information:Please Note: There there are no tube cages included.



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