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Cool. Tell what voltage and current you need so I can give you a parts list. Sent from my SM-A715F using Tapatalk

I have 10x PCBs of a regulated adjustable heater circuit plus a delay-relay control circuit. The delay will trigger a relay after a certain amount of time (you decide) after switch-on. It was designed to mute the output of a pre-amp during start-up but can also be used to switch on the HT after...

Bad caps will let DC through hence a path to ground so yes they could have taken out your rectifier. 450VAC caps will handle 600VDC but what voltages is your amp using? Measure the power transformer outputs without the rectifier valve in its socket. RS sells motor run caps - they are usually...

The 1VAC you measure may just be capacitive coupling. The main thing is that you have now firmly earthed your chassis and thus rendered the device safe. Check to see how or where, your circuit?s ground (RCA negative) is connected to chassis there should be only one such connection - are the RCA...

2A fuse is s bit large for 2x El84s plus a 12AX7. Get some slow blow fuses (usually have a "T" prefix/suffix) 500mA, 400mA, 350mA etc and use the lowest value that doesn't pop on switch on. Sent from my SM-A715F using Tapatalk

Use a three-wire mains connection and remove the 10nF caps. Your chassis is 'floating' you want to connect it to 0V - mains earth. Sent from my SM-A715F using Tapatalk

I presume the device has a mains transformer and ALL circuitry (including heaters) is connected to transformer secondary. Check this - if it is so then you want to remove all wiring up to the input of the mains transformer and replace with 3-core mains cable. Be sure to fuse and switch the...

Temperature is the primary foe here. As the caps heat up it causes the electrolyte to evaporate ultimately resulting in a capacitor that is not. Current is the cause of temperature rise (P=IxIxR to a 1st approximation) - 1st cap in a linear PSU is subjected to a constant ripple current that is...

A giant of the 20th century

Less said about Quads - congrats on the Altecs! Sent from my SM-A715F using Tapatalk

:thumbs: :thumbs: :thumbs:

x-over type depends on your design. "Ideal" x-over is a 4th-order Linkwitz-Riley alignment. That is the only configuration that "sums flat" IOW if you add the response of the two crossed-over drivers together you will get a flat frequency response. Other x-over configurations give you dips or...

Trace the circuit it will be very simple. 1/2 ECC83 driving an EL84 per channel Sent from my SM-A715F using Tapatalk

Usually that is oscillation due to to parasitic feedback. Post the schematic for some clarity. Sent from my SM-A715F using Tapatalk

Roland?s Linear Arithmetic synthesis was based entirely your belief - and it worked rather well. They discovered that the initial or attack transient of a sound was the part that most defined what the sound was, so LA synthesis combined sampled attacks attached to synthesised waveforms to create...

Keep the Touch and get a Topping E30 DAC. ~R2500 much better DAC than both Onkyo and Squeezebox

If you going in person to Mantech write down on a piece of paper what you want to buy and what you will be using it for. By the time you get your stuff you may have forgotten why you are there - the waiting time at Mantech is a killer.  Rather go to RSE Electronics a block away - they have...

The waveform is ?stored? as steps. Those ?steps? represent very high frequencies so any low pass filter will turn them into curves which is what all DACs have/rely on this is called ?interpolation?. The idea of ?connecting with curves? in a DAC is not at all new there are many ways to do it...

If you dont have UL transformers you can run the EL84s in either triode mode or pentode mode. Triode mode will give you ~6 watts. Pentode mode ~17 watts at a screen voltage of 300V, according to the datasheet, might be less depending on transformers. UL mode is in fact a midway electrically...

It's your speakers - valve amps especially little ones, can struggle with certain types of speakers Sent from my SM-A715F using Tapatalk