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 tubes 4 hifi
 "the path of least resistance is through a vacuum"

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Tubes 4 HiFi is also known as Vacuum Tube Audio

Our best known product is the VTA ST70 PCB modification for the Dynaco ST-70 amplifier,
that first appeared in a Glass Audio magazine article in 1989.

You can purchase any of our products here from these web pages, making payment with a credit card through PayPal,
or sending us a money order. Thanks for your support!

Please contact me at anytime to order these items or to inquire about other products.

send email to

Roy will be away on vacation from March 25 to April 25, so please bookmark this page and come back later!
Bob will still be available to sell amplifier kits only (Roy handles ALL other items, modifications, upgrades, preamps, etc)


our famous VTA70 driver PCB upgrade for your amp!


we've been selling this modification/upgrade for the ST70 for 29 years now!!


Bob's amplifiers

ST70 - VTA70 amplifier

ST120 - VTA120 amplifier

M125 monoblocks

Roy's pages

ST70 mods & upgrades

MK3 monoblocks

PASSIVE "preamp"

phono only preamp kits
PH14 PH16

line stage preamp kits
SP12 SP13 SP14

assembled SP14 with remote

click here to go to our downloadable Dynaco manuals page

our dealer on the east coast is Bob Latino. . . check out his BRAND NEW Dynaco ST70 kits OR ready-built amps
including the high powered stereo ST120 tube amp and new M125 monoblocks click here!!

you can send email to Bob Latino at: for info on these complete kits or amps .


visit our "Dynaco Tube Audio Forum"

our Glass Audio magazine article comparison test of ST70 modifications



send email to ROY at:




 tubes 4 hifi
 "the path of least resistance is through a vacuum"