VTA Tube Amp Kits
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1. The new 16 gauge STAINLESS STEEL chassis is identical in size, shape and markings to the older original 18 gauge nickel plated steel frame. This 16 gauge chassis is .055 inches thick, and weighs 1.25 pounds more than the 18 gauge chassis. The heavier chassis better supports the amp's transformers and the extra 1.25 pounds of metal acts as a better heat sink to help the amp run cooler. This upgraded chassis is NON-MAGNETIC and removes any magnetic interference effects of a steel chassis on the audio circuitry. 2. The new USA made power transformer has a higher stack lamination than the original Dynaco power transformer and is rated for 120 volts instead of 115 like the old design. The two tube heater legs are rated for 5 amps each instead of 3 amps each like the old design. This beefed up transformer (which has a bottom plate like the original PA-060 to prevent EMI from the transformer from reaching the audio circuitry) allows the use of KT88 output tubes in place of the EL34 tubes for a slightly different tonal presentation. Four heavy duty neoprene isolation mounts are used to attach the transformer to the chassis. 3. The A-470 output transformers are brand new USA made custom production transformers. They use the same interleaved/layer winding technique as the original cloth lead A-470's and incorporate the same high quality M-6 grain oriented laminations. They are dimensionally accurate to the original design and have a durable heat resistant black epoxy finish. 4. The old stock 30, 20, 20, 20 electrolytic quad cap which had marginal storage capacity for this amp has been replaced by a 80, 40, 30, 20 quad cap for almost double the power storage capacity. 5. The upgraded VTA driver board uses three new 12AU7 triodes in place of the two mediocre sounding 7199 pentode/triode tubes. Dynaco saved money using a two tube 7199 board design but made some serious compromises in sound quality. The older ST-70 design had one bias control for each channel whereas the VTA board has a separate bias control for each of the four output tubes. This design allows for individual adjustment of each output tube bias. Matched pairs or quads of output tubes are not necessary with this design. Eight quality Sprague 716P "orange drop" coupling caps are included with the board. 6. The input jacks are gold plated and have a wider (9/16ths of an inch) spacing to allow for newer design thicker interconnects. 7. The output jacks are modern gold plated 5 way binding posts with binding posts for 4 or 8 ohms. 8. The 7 octal tube sockets are modern high quality Celanex sockets. These sockets are very durable and more reliable than the older stock phenolic tube sockets found in the original amps. 9. Includes two triode/pentode switches to allow switching between these two modes of operation. The switching may be done while the amp is running to compare the two sonic presentations.
Brand NEW ST70 amplifiers, in KIT form or wired and tested !
"Shipping costs will be invoiced separately - 36 pounds from zip code 01566 by UPS ground"
$769 + shipping IN KIT FORM with all parts but NO TUBES
$899 + shipping IN KIT FORM with all parts and tubes and EL34 output tubes
$999 + shipping IN KIT FORM with all parts and tubes and 6550 output tubes
$1165 + shipping WIRED with NO TUBES Shipment within 3 - 4 weeks
$1295 + shipping WIRED with ALL tubes & EL34 output tubes Shipment within 3 - 4 weeks
$1395 + shipping WIRED with ALL tubes & 6550 output tubes Shipment within 3 - 4 weeks
240 volt operation add $70 to KIT amp price
Driver board Low ESR Nichicon power supply upgrade capacitors - 2 X 100 uF and 2 X 47 uF + $15 (must be ordered at the same time as a kit or wired amp or extra shipping charges will apply)
Four matched Russian PIO (paper in oil) main coupling caps + $30 (must be ordered at the same time as a kit or wired amp or extra shipping charges will apply)
Triode/pentode kit as used on the VTA ST-70 pictured above. This kit may be added to any VTA board driven Dynaco ST-70
Photo below of the internal wiring of a VTA ST-70 amp with the Triode/Pentode switches . . .
you can send email to Bob Latino directly here for info on these complete kits or amps . . .
new VTA120 amp !!
Now available for those that need a little more power is the Dynaco VTA ST-120.
VTA ST-120 KIT with ALL TUBES > $1199 + shipping VTA ST-120 KIT with NO TUBES > $949 + shipping VTA ST-120 WIRED and TESTED amp with ALL TUBES > $1665 + shipping - shipment in 3 to 4 weeks VTA ST-120 WIRED and TESTED amp with NO TUBES > $1435 + shipping - shipment in 3 to 4 weeks
Also check out our VTA M-125 monoblock kits at my main web site > http://www.tubes4hifi.com/bob.htm
$1778 + shipping for two VTA M-125 monoblock kits
and my Facebook web page > http://www.facebook.com/vta.amp.kits
for pictures of all our VTA amp kits
"What's it like to build a VTA Dynaco ST-70? - Check the two links and reviews below ..."Building the ST-70 kit amp
Building the ST-70 amp kit on Audiokarma
Review #1 on the Audio Asylum
Review #2 on the Audio Asylum
Review #3 on the Audio Asylum