DYNACO ST-70 6GH8A Driver Board PC-3

 
DYNACO ST-70 6GH8A / ECF82 DRIVER BOARD


This Dynaco ST-70 driver board PC-3 has been developed and designed to be a drop-in replacement for Dynaco 7199 board. It follows the original wire hole layout, but it was modified to use widely available 6GH8 / 6GH8A / 6KD8 / ECF82 tubes instead of the obsolete and hard to find 7199 tubes. Today one can find many high quality European and US NOS tubes of any of these types at accessible prices and enjoy tube rolling with this driver board. It was also modified to accept modern and NOS coupling capacitors of various types and dimensions. Thanks to that, the board maintains the musical mid frequency character of the original Dynaco 7199 board and extends that performance to bass frequencies, where in the original design the weaknesses are apparent.
Made of high quality epoxy fiberglass FR4 material of 1.6 mm (0.062’) thickness, it is double sided with solder rings on the top layer. The solder reflow process is performed on both layers and inside every hole. A blue solder mask is applied on both sides. All connections and elements on the board are silkscreened with the original DYNACO numbering, so you can use the original DYNACO ST-70 manual to complete it.

Polypropylene coupling capacitors, silver mica capacitors, metal film, metal oxide and carbon oxide resistors were used, as well as one NOS platinum matched pair (two tubes) of 6GH8A EI Philips. They were made in the 1980’s in the EI Tube Factory, under Philips license and with some of the genuine Philips materials. Intended for export, they passed strict quality control. Every pair used is selected from the same batch with the same date codes. The tubes are real platinum matched pairs, tested on a calibrated METRIX U61-B tester.

Please note that we are responsible for the board, parts and tubes only. Once soldered to, all warranties and guarantees are voided.


DYNACO ST-70 Stereo 70 ST70 – 6GH8A / ECF82 PC-3A DRIVER BOARD (PCB Only)
PCB 12.5$ + 4.95$ shipping


DYNACO ST-70 Stereo 70 ST70 – 6GH8A / ECF82 PC-3A DRIVER BOARD (PCB + Two Tubes)
PCB + Platinum matched pair 6GH8A EI Philips 27.50$ + 8.95$ shipping

In this KIT you’ll get one PCB and one matched pair (two tubes) of NOS 6GH8A. They are made back in 80s in EI tube factory, under Philips licence and with some of genuine Philips materials. They were intended for export, so they have passed strict quality control. Every pair is selected from the same batch with same date codes and tubes are real platinum matched pairs, tested on my calibrated METRIX U61-B tester.


DYNACO ST-70 Stereo 70 ST70 – 6GH8A / ECF82 PC-3A DRIVER BOARD (Complete KIT + Two Tubes)

Complete KIT (PCB + All resistors and capacitors + Two ceramic tube sockets + Platinum matched pair 6GH8A EI Philips) 57.50$ + 8.95$ shipping

This is complete KIT! You’ll get one PCB, all resistors and capacitors, two ceramic tube sockets and one matched pair (two tubes) of NOS 6GH8A. They are made back in 80s in EI tube factory, under Philips licence and with some of genuine Philips materials. They were intended for export, so they have passed strict quality control. Every pair is selected from the same batch with same date codes and tubes are real platinum matched pairs, tested on my calibrated METRIX U61-B tester.

All coupling capacitors are high quality WIMA MKP Metallized Polypropylene (PP) Capacitors. 120nF are used vs original 100nF, and now amplifier has better bass response.

Also silver mica capacitors are used, metal film, metal oxide and carbon resistors for good performance and lowest hum.



DYNACO ST-70 6GH8 Stuffed Driver board PC-3 PCB + matched pair 6GH8A EI Philips
79.50$ + 8.95$ shipping

This is complete PCB with all parts already soldered. It also includes one platinum matched pair of 6GH8A EI Philips, easy way to complete your first amplifier.


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