ike 60W power amp manual the diytube series

Transcription

1 ike 60W power amp manual the diytube series

2 Disclaimer Under no circumstances does Parks Audio LLC assume liability or responsibility for injury or damages sustained in the assembly, test or operation of this PCB design or for damages to any other equipment connected to it. Assembly and education is buyers responsibility. Parks Audio LLC reserves the right to make design changes or improvements without the obligation to revise prior versions. All specifications are subject to change without notice. WARNING: Lethal voltages (greater than 00VDC) are present in this project. Use a Variac or isolation transformer while working on and testing the unit. Use a rubber mat to stand on while working on and testing the unit. Keep one hand in your back pocket if probing voltages with a DMM. Wrap a small piece of electrical tape around the test lead probe shaft to expose just the tip. Do not connect or disconnect wires to the terminal blocks when unit is powered or plugged in. Lethal voltages exist in the capacitors even after unit is powered down, so wait at least ten minutes after unplugging to allow charge to dissipate. Warranty Information All goods purchased from Parks Audio LLC have a thirty (0) day warranty against defects from the date of purchase.

3 Preparation Before assembly some preparation needs to done. Parts must be purchased, a work area needs set up and chassis decisions should be made. The axiom haste makes waste has never been more true. Make sure your chosen transformers and the board will fit comfortably using the chassis of your choice. Please use the bare PCB to make a template, or use the PCB directly on the chassis as shown on the website, for placing socket holes and mounting holes. Also, plan where RCA connectors, binding posts, standby & ON/OFF switches and the AC cord will be oriented on the chassis. Small-grid graph paper is a handy template. Physically lay out the parts in a space equal to your chassis to assure everything fits. Lastly, please note the PCB has two identical sets of silkscreens allowing mounting of parts on either side, according to your construction technique, but the tube sockets can be mounted only on one side. Typical construction is with the sockets and bias trim pots on the top side and all other components on the bottom side. Overview of the Schematic and Design The design closely resembles the Eico HF-series which used a modified Mullard -0 circuit. The Ike, or Eiclone (pronounced I clone) uses the AX as the voltage gain stage tube, as did the classis Eico HF- and HF-9. This gain stage DC-couples to a 6SN long-tail pair phase splitter driving a pair of push-pull EL tubes. It is possible to build either a fixed bias or cathode biased unit using the uniquely configurable PCB. Also, the bias supply and grid resistors in the standard design are compatible with alternate power tubes such as 60s and KTs. Using the Assembly Drawing The assembly drawing is a quick reference for locating components and the numbering scheme for the connectors. Currently, the assembly drawing is of the bottom side of the PCB where most of the components will be placed. The drawing also makes a good place to jot any notes during construction. Parts Selection The stock components on the parts list will make a fine amplifier, but this hobby is DIY, so part subbing is not discouraged. In fact, it is fully expected that some experimenters will come up with great modifications please share them with us when you do! Do keep any substitutions at the same rating or higher. Be aware that some footprint sizes must be strictly adhered to, especially the electrolytic capacitors. The power supply electrolytics in particular must have a diameter of mm or less. A height of 0mm is preferred as it allows use of a two inch high chassis. Soldering This PCB is a double-sided, plated through-hole design on.09 FR material with LPI (liquid photo-imagable) solder mask and ounce copper per side. When soldering these components, let the solder flow through the hole to form a teepee on both sides of the board for an optimum connection. Ground plane connections sink a lot of heat from the soldering iron, so take care to do these well and you may have to touch up from the opposite side. Dont forget to use the checkboxes on the parts list sheet. X through the box after you have stuffed the component in place.

4 TIP: PCB Stuffing You can use the flat end of the 0-pole connector as a lead bending tool. This works for most of the parts. Do take care to not damage the meniscus of the components. Insert all the components in each step before soldering, bending the leads down to hold them in place. This allows one to fix any placing errors that might occur very easily. Use a good pair of snips to remove the excess leads and then go to the next step.. Stuff all fixed value resistors onto the bottom of the PCB (diytube logo is lower left). R & R can be substituted with a choke. A super-imposed footprint for a twopole connector is available for easy connection via spade terminals.. D & D are each made of two diodes. Solder them together in series before soldering them to the PCB. Then stuff Da-b, Da-b & D. Mind the orientation of the cathode, which is represented by a stripe on both the silkscreen and the diodes body.. Stuff variable resistors if you are building a fixed bias design. If you plan to adjust these from a hole in the top of the chassis, then place them on the top of the PCB (the socket side diytube logo is lower right). Stuff C9 through C. Mind the polarity. The board has symbols to show where the positive terminal from the capacitor should be placed even though it is the negative side that is usually marked on modern electrolytics. The bar should be aligned where the silkscreen is marked NEG BAR.. Stuff C, C6 & C. Mind the polarity. 6. Stuff R6, the IRCL. Make sure it is not leaning on C0 or the terminal block because it gets hot. Leave / of the lead length showing on the component side this allows you to bend the part away from C0 without damaging the meniscus.. Kink leads on C, C, C, C, C & C and stuff.. Before placing the ceramic tube sockets, prep the pin sockets with a junk box tube or small nail. Dont pry and break the socket, but you dont want to damage a favorite tube either. Then place and solder all the tube sockets make sure they are mounted to the top of the PCB (diytube logo is lower right). Make sure to use enough solder. 9. V has multiple configurations and needs to have a set of jumpers soldered in place. Watch clearances around other pins. For a AX tube, solder a small, /" piece of wire from the square pad marked Z to pin of the nine pin socket and do the same from square pad Y to pin 6. For a 6SL tube, solder a / piece of wire from the square pad marked Z to pin 6 of the nine pin socket and a / from square pad Y to pin. 0. Place and solder the terminal blocks. As with the sockets, use enough solder. If you are planning to use a choke in the filter supply, I recommend using a two-pole block over-top of the R/R footprints and spade connectors on the choke leads. The terminal blocks facilitate easy removal of the amplifier board for troubling-shooting or tweaks.

5 . Adjust the both R and R6 with a DMM so that Pin (closest to edge of the board) and the wiper (the center pin) are within a few ohms of each other. You may hear a clicking when at this furthest extreme that is normal. Now the bias will be at max voltage on first power up.. Connect Rx in series with Cx from the ohm tap to ground. This provides a constant load for the amplifier even into inductive loads.. Snip excess leads and compare your board to photos from the website. Carefully go over your work, looking for: a. cold solder joints (these will look dull) b. solder splashes and shorts between socket pins c. connections in which solder didnt flow to the other side (like ground plane connections) d. proper capacitor orientation First Power Up. With the unit NOT plugged into mains AC, use the Voltage & Resistance Chart to ohm out the board.. Disconnect J- (the B to the output transformer).. Insure you have a fuse installed, and power up unit without tubes.. Compare J Main Terminal voltages with chart. They should be similar, though the B will be higher (over 00V) as the circuit is not loaded.. Measure the bias voltage at test points TP and TP. These should be at least -0V. 6. Power down and unplug the unit from AC mains. Let the residual B bleed off for ten minutes before reconnecting J- and inserting the tubes. Adjusting Bias WARNING: This is done while the unit is ON and IDLE. Take care and follow proper high voltage safety rules. With an insulated adjustment tool and a DMM (at low voltage setting), adjust bias pots clockwise (up) or counter-clockwise (down) to get the voltage at TP and TP to be 0mV. This means the cathode current is ma. Plate dissipation at idle equates to around W. V Plate Voltage * ma Cathode Current = 6.W Check again after a few hours use and readjust if necessary. Check again after one week, then one month. It is highly recommended to place an in-line fuse, e.g. /A Fast Blo, between the B center and ground. In case of a runaway tube or other catastrophic failure, this may protect your amp beyond the main fuse.

6 Ike PCB parts (one monoblock) Revised: 9/9/ Tip: Put a dot in the checkbox if you have the part already as a quick reference when ordering parts. X out the checkbox when you have installed the part on the PCB. Item QTY Reference Part Mouser Part Cost 6 R K, /W -RN60D-F-K. R K, /W -RN60D-F-K. R,R,R K, /W -RN6D-F-.0K.6 R,R,R 00, /W -RN6D-F R,R,R,R, 00K, W 9-0NW00K0J.0 R,R,R,R,R6 R6 M, /W -RN6D-F-.0M.6 R K, W 9-0NWK00J.0 R K, /W -RN6D-F-.0K. R9 0K, W 9-0NW0K00J.0 R0 K, W 9-0NWK00J. R,R6 K Pot -T9YB-K.9 R9,R0 K, /W -RN6D-F-K.6 R,R 0, /W -RN6D-F-0.6 R,R 00, W 9-0NW00R0J.0 R9.K, W 9-0NWK00J.0 R0 00K, W 9-0NW00K0J.0 R K, W -K-RC. R 0K, /W -RN6D-F-0K.6 R9,R0 wire jumper R 90K, W 9-0NW90K0J. R6 IRCL -CL90. R9.K, /W -RN60D-F-.K. Rx 0, W -0-RC. C.uF, 0V -K.0 C,C.uF, 60V 66-ECW-FAJ0J 0. C 0pF, 00V 9--00V0. C 0pF, 00V 9--00V0. 6 C9,C0,C, 0uF, 00V V. C,C,C C uf, 0V 6-UVZW0MHD. C6,C uf, 0V 6-UVZE0MHD.9

7 C.uF, 60V 99-60V0.-F. Cx.uF, 0V -0K.6 Da-b,Da-b,D UF00 Diode 6-UF00-E.9 J pin Term Block J,J pin Term Block J 0pin Term Block -66. Choke Filter Mod: Omit R & R. Add the following: L H, 0mA choke -CX. J pin Term Block W Edcor Mod (not compatible w/ choke filter mod): R.K, /W -RN6D-F-.K. R,R 0, W 9-AC0W0R00J.0 R9 0K, W 9-0NW0K00J.0 R9.K, /W -RN60D-F-.K. C.00uF, 60V -60K 0. C 0pF, 00V V0.6 C.uF, kv 99-KV0.-F. Go to and log in to your account. Use Service & Tools > Parts List Importer. Paste list into window and Import to My Current Order. CRTL-C to copy. CTRL-V to paste. /* start cut-n-paste */ -RN60D-F-.0K -RN60D-F-K -RN6D-F-.0K -RN6D-F NW00K0J 9 -RN6D-F-.0M 9-0NWK00J -RN6D-F-.0K 9-0NW0K00J 9-0NWK00J -T9YB-K -RN6D-F-K -RN6D-F-0 9-0NW00R0J 9-0NW0K00J 9-0NW00K0J -K-RC -RN6D-F-0K 9-0NW90K0J -CL90 -RN60D-F-.K -0-RC -K

8 66-ECW-FAJ0J 9--00V V V 6 6-UVZW0MHD 6-UVZE0MHD 99-60V0.-F -0K 6-UF00-E /* end cut-n-paste */ Ike Chassis parts (one monoblock) Revised: 9/9/ Item QTY Reference Part Mouser Part Cost SW Neon Power Switch -R-66B-G. IEC Power w/ Fuse 6-R0-E.9 A Midget Fuse 0-GMA- 0. -Prong AC cord -P X0X Chassis 6--9BK.60 (omit if FPE) X0 Bottom 6--9BK.90 RCA Red Jack 6-NYS6-. Red binding post 6-R9R-EX. Blk binding post 6-R9B-EX. Red Test Points Black Test Points Standoffs /X/ Bushings /* start cut-n-paste */ -R-66B-G 6-R0-E 0-GMA- -P BK 6-NYS6-6-R9R-EX 6-R9B-EX /* end cut-n-paste */

9 Ike Tubes, Transfomers, Nuts & Bolts (one monoblock) Revised: 9/9/ Item QTY Reference Part Triode Part Cost 9 V AX/ECC axtesla $0.9 V 6SN types 6sn $.9 V,V EL/60/KT JJ-EL-MP $.9 V 9pin PCB Socket 9pinpccer $. (0.0 diameter, ceramic) V-V pin PCB Socket pcceroctsckt $.0 (" diameter, ceramic) From T Hammond BX Power Transformer $.9 T Hammond 60N Output Transformer $.0 or From T Edcor XPWR06 Power Transformer $. T Edcor CXPP60-MS-.K O.T. $.0 I source these locally at Ace Hardware, or use boltdepot.com (pn# included). 0 #6 x / sheet metal screw - SS 00 6 #6- x / machine screw - SS 6 #- x / machine screw - SS 6 # flat washers - SS 9 # K-Lock nuts - SS 00 #6- x / machine screw - SS 6 #6 K-Lock nuts - SS 09

10 NF V R 00K diytube Schematic Page Fixed Bias EL Ike Main Circuit J Input J Output Transformer Hookup R K V AX g k 6 h'' a ht h a'' g'' k'' C 0pF R9.K R9 0K, W C.uF R 00K R K R9 K g g h p h k g V EL R K R K R 00 6.VAC B 6.VAC A V 6SN g 6 k h'' a h a'' g'' k'' V 6.VAC A 6.VAC B R 0 R K NF 6.VAC B 6.VAC A R0 K, W Bias V R 00K R K V EL g g h g p 9 R R6 K K R0 K R K,W C.uF h k C 0pF R6 MEG C.uF R 0 J Output Transformer Hookup

11 V V V J H Choke (ALT) Fixed Bias Circuit -66VDC Output after C-R-C w/ mv ripple Bias V C uf R 90k R0 00K, W R 00k R6 00k C 0uF C 0uF R9.K, W R 00k R 00k C 0uF C 0uF R 00, W R 00, W R 00k R 00k C9 0uF C0 0uF Da Da Db Db R6 J Power Connector C.uF R K,W D C6 uf R 0k C uf Keystone CL-90 diytube 6.VAC A R9 Jumper Schematic Page Fixed Bias EL Ike Power Supply R 00 R 00 R0 6.VAC B Jumper

12 Connect directly to chassis green 0VAC white diytube IKE P CB rev B J red red/yel red green grn/yel (unused) green SW SW: Connect pin to the fuse, pin to the primary and pin to J-, as the neon bulb is in parallel to the primary winding. Hammond BX 0VCT Power Transformer -I suggest using R & R instead of the heater CT. If you decide to use this CT, then do not populate R & R. -VCT taps are not used - isolate & cap or wrap w/ tape F J RCA Input J J brown brn/yel red blu/yel blue yellow grn/yel blk/yel green OHM OHM GND Rx 0 ohm Cx.uF Hammond 60N Output Transformer Just think green/yellow to green, and /yellow to. Logical Layout of the Fixed Bias Ike with Hammonds

13 Connect directly to chassis green 0VAC white diytube IKE P CB rev B J red /red red brown brown SW F SW: Connect pin to the fuse, pin to the primary and pin to J-, as the neon bulb is in parallel to the primary winding. Edcor XPWR0 60VCT Power Transformer -VCT taps are not used - isolate & cap or wrap w/ tape J RCA Input J J brown white/brown red white/blue blue green yellow orange 6 OHM OHM OHM GND Rx 0 ohm Cx.uF Edcor CXPP60-MS-.K Output Transformer Logical Layout of the Fixed Bias Ike with Edcors