![]() No heater power supply is provided, as the 6.3Vac winding is used to power the heaters in most tube-based power amplifiers. A quick rule of thumb might be that the zener should draw about half the current as the driver stage. The zener current limits should never be approached, save at turn-on, when no tubes are conducting yet. By using four zener break voltages, we can select the shunt regulated driver-stage voltage in 25-volt increments. These last two voltage outputs also use RC filtering that hold 47♟/500V capacitors, bypassed by 2.2♟/630V capacitors polypropylene capacitors. The input-stage output cascades from the driver stage, so it can benefits from the regulation. The driver stage offers the option shunt regulation of the voltage with a string of zeners. On the other hand, we could leave resistor R9 off the PCB and attaches the leads from an external choke instead. The RC resistor can be shunted by an optional 12V zener, which would function much like a swinging choke, as at idle the RC filter scrubs away ripple, but at full output the zener engages thus, the output tubes do not see their B+ voltage collapse, as the zener's engaging stops the voltage from dropping any further across the RC resistor. ![]() Here is the simplified and truncated schematic of the circuit after the rectifiers. Each 470F/250V capacitor is shunted by a 110k/3W bleeder resistor that also ensures equal voltage division between capacitors. ![]() The output stage consists of two 470F/250V capacitors (C7 & C8) in series, making for a total of 235♟ of capacitance and a 500V rating, which then travels through a an RC filter (R9, C11, C12) that holds the same two 470♟ capacitors in series both sides are bypassed by 2.2♟/630V capacitors polypropylene capacitors. The PS-11 makes building a tube power amplifier much easier, as it provides three output voltages taps: one for the output tubes, one for the driver stage, and one for the input stage. Well, the workaround is not to use metal standoffs, replacing them with nylon standoffs, which I fortunately have. How had I failed to list them at the store? Well, after finding my assembled test build of the PS-11 PCB, I discovered my previous reasoning for withholding the release: the rectifier circuit pads at the bottom of the PCB were too close to the mounting hole.Įverything was great, until a metal 1/4 inch standoff was attached to the PCB. Had I sold out and never made more PCBs? I found the files for the user guide and, then, I found the PCBs, which were made nine years ago. He could not find it at the GlassWare-Yahoo store-nor could I. He planned on running 6.3Vac on all the heaters and required a high-voltage power supply capable of withstanding a B+ voltage of 440Vdc. A customer asked which GlassWare power supply would be best suited for his rebuild of an old tube power amplifier he owned. M-6 29 ga.This is something of an embarrassing story. ![]() Polyester Film Electrical Insulating Tape This unit comes with steel end bells for mounting with the use of four screws. color coded lead wire around 15 inches (38cm) long. The addition of glass fibers allows a higher heat deflection temperature and it brings the material to a class HB UL temperature classification. Injection molded Nylon 6/6 with the addition of 30%-35% glass fibers. Each unit is hand stacked to assure at least 92% stack. All windings use heavy insulated wire to provide excellent manufacturing yield, lower customer cost and superior life.ĮDCOR uses the finest M6 line grain oriented steel cores. The output impedance is designed for speakers.Īll units are wound with the finest virgin copper magnet wire. The input is designed for a 10K Ohms impedance source. ![]() The CXPP series was designed as a high quality output transformers push-pull tube amplifiers. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |