Tavish Design 6SL7 Benutzerhandbuch

TAVISH DESIGN,LLC

Made in U.S.A.

Vintage 6SL7 Phono Stage (MM / MC)

Assembly and Setup Manual

TABLE OF CONTENTS

1. Introduction & Quick Start 2

2. Safety Considerations 3

3. Assembly 4

4. Setup & Operation 12

4.1. Initial Setup

4.2. Operation

4.3. Tube Replacement

5. Technical Information 16

5.1. Specifications

5.2. Schematics

5.3. Parts Placement Diagram

5.4. Parts Lists

6. Warranty and Service 29

7. Do-It-Yourself Guidance (FAQ) 30

8. Design Changes With Release 2.1 32

9. Copyright, Trademark, and Disclaimers 32

Manual Release 2.3a (17 February 2020)

1INTRODUCTION AND QUICK START

Thanks for buying the Vintage 6SL7 Phono Stage!

Tavish Design’s Vintage 6SL7 Phono Stage is a passively-equalized, two-gain-stage design using the 6SL7

octal dual triode, a vacuum tube first introduced (by RCA) in 1941, and one which has remained popular

with audio enthusiasts ever since. And, the basic circuit topology employed in our Vintage Phono Stage

has also remained popular for decades. The reason for the endurance of this straight-forward topology

is simple: with appropriate updates, it is very difficult to beat without going to elaborate multi-tube

circuits. In fact, this simple phono stage outperforms many (if not most) high-end products.

Vacuum tubes present some unique safety considerations, so please take time to look over the safety

considerations in Section 2.

Kit assembly instructions begin in Section 3. If you purchased the Vintage 6SL7 Phono Stage as an

assembled unit, please see the Quick Start instructions below.

Feel free to contact Tavish Design if you have any questions (info@tavishdesign.com).

Quick Start

1. Install the tubes. See Section 4 if you haven’t done this before.

2. Connect your turntable to either the Moving Magnet (MM) or Moving Coil (MC) input and set the

rear panel toggle switch to the corresponding position. Default settings for the Vintage Phono Stage

should work well with most MM and low-output MC cartridges. You can customize cartridge

loading, see Section 4.

If you have a high-output MC cartridge, the MM input is probably the best one to use, but it

depends on your cartridge output level, and you may want to adjust the internal cartridge loading

and gain settings. See Section 4.

Be sure to connect the ground post on the back of the phono stage to the ground post on your

turntable.

3. The phono stage takes 30 –40 seconds to warm up, as indicated by the blue “Ready”LED on the

front panel. The phono stage will not pass signal until then. Turn down your volume control the first

time you play an LP, until you are familiar with the appropriate volume setting.

6SL7GT

Front

2SAFETY

1. To avoid the risk of electric shock, do not operate the amplifier without the top cover in

place. This amplifier uses high voltages internally which could cause an electrical shock,

possibly resulting in injury or death. Lethal voltages can remain in the electronics after the

unit is unplugged. Refer servicing to Tavish Design, LLC. If the unit must be opened for

servicing, unplug it and wait at least 10 minutes for internal capacitors to discharge.

2. Do not operate the amplifier without the vacuum tubes in place. Removal of the vacuum

tubes exposes internal circuity to contact and presents a shock hazard. This hazard is similar to

removing a light bulb from its socket.

3. Do not allow liquids (such as from a spilled drink or flower vase) to run into the amplifier, as

this can damage the amplifier or create an electric shock hazard. Do not operate outdoors or in

wet areas. Do not allow rain to enter the amplifier (by placing the unit next to an open window,

for instance).

4. A broken or improperly seated vacuum tube can cause electric shock. Do not operate the

amplifier if any vacuum tubes have broken glass shells. Align the tubes if any are leaning or not

fully seated, prior to operating the amplifier. Vacuum tubes get hot, so allow them to cool

before handling.

5. To avoid electric shock, do not insert thin metal objects between the vacuum tubes and the

cover, or allow children to do so. A metal object inserted into the amplifier could possibly

contact high voltages present internally. This hazard is similar to that of sticking a pin or thin

screwdriver into an electrical outlet.

6. Keep out of reach of children. A high shelf or table is better than a low one, if children are

present.

3ASSEMBLY

Warning: This amplifier uses high voltages which could cause an electrical shock, possibly resulting in

injury or death. Therefore, these assembly instructions are intended for electronics technicians (or

those with equivalent skills) having experience with high-voltage electronics. The usual safety

procedures required when working with high voltages must be followed, and they are described only

briefly in these instructions. If you are unfamiliar with these procedures, you should not attempt

assembly. Please read through these instructions before beginning assembly. If you are in doubt

about your ability to safely and successfully assemble the kit, please send it back, or first get some

experience with other electronics kits. No liability is assumed by Tavish Design, LLC. The ARRL

Handbook for Radio Amateurs1has a useful chapter on electrical safety.

Kit assembly requires a soldering iron with a fine tip and a digital multimeter (DMM), along with other

normal electronics workshop tools.

Unpack the box and verify the following items:

Quantity

Item

Printed circuit board

(4 JFETs

are

pre

install

on the PCB

in the complete kit

)

Enclosure

Decorative flange

Wall transformer

Bag of

metal film

resistors

Bag of 2

carbon film or metal oxide resistors, and trimmers

Bag of 2

electrolytic

capacitors

Bag of 19 film capacitors

Bag of

diodes, transistors, and ICs

(not including 4

JFETs

, which

are pre

install

ed)

Bag of

miscellaneous PCB

mounted components

Tube sockets

Bag of hardware and chassis

mounted components, including sw

itch and panel LEDs

Vacuum tubes (

Sovtek 6H9C/6SL7GT

)

PC mounted toroidal transformer

Detailed parts lists are included in tables 5.2 –5.6. Use the schematic, parts lists, and parts placement

diagram in section 5 to identify the correct location for parts.

1http://www.arrl.org/shop/ARRL-Handbook-2015-Softcover-Edition/

Step-by-step Instructions:

1. The surface mount JFETs are supplied pre-installed with the complete kit. If you purchased the

blank PCB, install the JFETs first. The 2SK209 are marked “XL”and the MMBFJ270 are marked

“61S”. Melt a small amount of solder on one of the pads. Then, holding the FET with a pair of

tweezers, re-melt the solder and place one leg of the JFET in the molten solder. Solder the other

two legs, then re-melt the solder for the first leg. Inspect the installation with a magnifying glass

to verify your solder joints.

2. Install the tube sockets. Align the socket’s index slot with the marking on the PCB, as show in

Photo 3.1. Double check the index alignment and make sure the sockets are fully seated against

the top of the PCB before soldering all pins.

Photo 3.1: PCB after step 2. Please note that this photo was taken prior to design revisions.

Photos 3.2 through 3.6 reflect the current PCB.

3. Install all resistors. Refer to http://www.resistorguide.com/resistor-color-code/ or

https://en.wikipedia.org/wiki/Electronic_color_code if you need help reading the color code on

1% resistors. It can be a good idea to place all the resistors on the PCB before soldering any of

them, to be sure you get them all in the right location. Don’t forget the jumpers R1, R8, R14,

R31, and R32: they are used to interconnect the separate ground domains on the PCB.

Photo 3.2: PCB after step 3.

4. Install Q2 and IC2-IC3 using a 3/8”#4-40 screw, flat washer, split washer, and nut to mount Q2

and IC2 (no flat washer needed for IC2) to the PCB before soldering. IC3 slides into heatsink HS1

and mounts upright.

5. Install D1 and D13 Zener diodes.

6. Install D7-D10 fast recovery diodes.

7. Install D3 Schottky diode.

8. Install D14-D15 1N4007.

9. Install D2, D4-D6 1N4002.

Photo 3.3: PCB after step 9.

10. Install trimmers R9 (500 Ω) and R23 (10 kΩ).

11. Install DIP sockets, noting that they have a polarity as marked on the PCB.

12. Install RLY1-RLY2, noting that they have a polarity as marked on the PCB.

13. Install the three PCB test points, a black one in the AGND pad, a red one in the HV pad, and a

yellow one in the P18 pad.

14. Install the rest of the small components, including transistors and capacitors, but not those

components that mount to the rear panel. Note the polarity of electrolytic capacitors and also

make sure that they are fully seated against the PCB.

Photo 3.4: PCB after step 14.

15. Install J1-J3, SW1, and U1. For J1-J2, remove the chrome cover to expose the black insulator

underneath before installing. This prevents the signal ground from shorting to the chassis (they

must be isolated to prevent ground loops). See photo 3.5 below. Solder only one leg of each

component, making sure they are seated against the PCB, then test fit the PCB in the enclosure.

Adjust the position of the rear panel components if needed and solder fully in place.

Photo 3.5: Switchcraft RCA connectors with chrome cover removed.

16. Prepare a 22ga. wire 2¾”(7 cm) long to connect the PCB wirepad CHASSIS to the rear panel

ground post, using the ¼-20 ground terminal. Prepare a 22 ga. twisted pair 5½”(14 cm) long to

connect the wirepads PS1 and PS2 to the front panel rocker switch, using 0.187”quick connect

terminals.

17. Prepare a 24 ga. red/black twisted pair 3”(7.5 cm) long with one red wire connected to the RMC

pad and one black wire connected to the RG pad. The other end will be trimmed to length later.

Prepare a 24 ga. white/black twisted pair 3”long with one white wire connected to the LMC pad

and one black wire connected to the LG pad. The other end will be trimmed to length later.

18. Install the power transformer using a 3/8”#6-32 screw, nylon flat washer, and #6-32 split

washer, and solder in place.

19. Install IC1 and IC5, and the fuse.

20. Install the eight ¼”long nylon hex spacers on the bottom of the PCB, using #6-32 nylon hex nuts

on the top of the PCB.

Photo 3.6: Completed PCB after step 20.

21. Double check that you have installed the components into their correct locations, and in the

appropriate orientation, according to photo 3.6 above. Check that all PCB connections have

been soldered. Set S1-S3 into their “factory default”positions according to tables 4.1 –4.3

below and photo 3.8 below.

22. Install the PCB into the enclosure base using eight ¼”nylon screws from the bottom, one #6-32

black oxide pan head screw from the back, and two #3-24 plastite screws for the RCA jacks.

23. Install 4 rubber feet and the serial number sticker on the bottom of the unit.

24. Install the white RCA jack in the lower chassis hole for the moving coil input. Make sure it is

insulated from the chassis using the nylon shoulder washer and flat washer. Connect the

white/black twisted pair (white to the center signal terminal), keeping the wires as short as

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