pragmasi
Responses from pragmasi
| Who needs a Preamp?? I think the most you can expect from a preamp is that it mitigates some limitation in the connected equipment and in all other ways is transparent.Most of the time a preamp is there for the convenience of switching and having a single control to a... | |
| Capacitors for HP filters in tube amps recommendations? I just realised the capacitors in the link above are 5% tolerance, shouldn't be too hard to find 1% ones though... in the UK they are available from both Farnell and RS Components.I’m also familiar with the term "parasitic", and DO understand it. ... | |
| Capacitors for HP filters in tube amps recommendations? I guess the important factors in this application are that we're working at line level and we are setting time constants in the audible frequency range. Line level means we don't need to worry about dealing with high currents, voltages or signific... | |
| Capacitors for HP filters in tube amps recommendations? All of the caps listed will be out performed by polystyrene in this application. Polypropylene are ideal when higher capacitance is required and the only other option would be electrolytic. I think there is a perception that more expensive must be... | |
| Capacitors for HP filters in tube amps recommendations? 100k and 80Hz requires .02uF, 30k and 175Hz .03uF. You parallel up .01uF caps (for caps in parallel you just sum the values), so five for each channel means $4.20 in capacitors. | |
| Capacitors for HP filters in tube amps recommendations? No problem... even if you are tempted to try expensive capacitors, buy ten of these and compare. The only dialectric that may work better than polystyrene for this application is C0G/NP0 ceramic (definitely not any other type of ceramic) which is ... | |
| Capacitors for HP filters in tube amps recommendations? Assuming we're talking line level here, there's no need for monster capacitors. Amp 1: 100k Ohms input impedance; 80Hz x/o.20n (0.02uF) created from two 10nF Polystyrene 1% Caps in parallelAmp 2: 30k Ohms input impedance; 175Hz x/o.30n (0.03uF) cr... | |
| Output Impedance and Speaker Impedance You can really take this as far as you want to...1) You say you know what you like (which is great) so if you like the sound you're getting stick with that... everyone seems to agree you're not going to damage anything.2) You can make up a lead to... | |
| Output Impedance and Speaker Impedance Looking at the spec for the MA7900 I'd guess you're probably okay. I don't know the mechanism they use to achieve 200W into all different impedances.The difference between the speakers' sensitivity is 4dB which means the less sensitive speakers wi... | |
| What is a non-active pre-amp stage?? Are their advantages to this design?? I don't think it's as simple as passive is always better... the rest of the amplifier is active, just no buffers or gain on the input. There always needs to be a reason for the extra components though.It's fairly easy to produce a very low distort... | |
| Something For The Fuse Guys ... Just out of interest and I don’t know the answer to this... do any ’high-end’ manufacturers use boutique fuses in their amplifiers?..'he says failing to walk away from the table.' | |
| Something For The Fuse Guys ... I'll try and answer your questions as well as I can.I design and build amplifiers, and although I shouldn't admit this given my previous sermon on health and safety - I have tested designs with no fuse at all during the early prototyping stages. I... | |
| Something For The Fuse Guys ... Just curious, pragmasi ... have you tried any of the after-market fuses in your system? I've used many different fuses in many different designs but not the ones referenced here, I would remember if I'd spent $120 on a fuse. I don't wan't to spoil... | |
| Speaker kits recomendations Maybe Horn TL hybrid lets talk speaker kits For a first build the A26 speakers are about as simple as you can get, there's no crossover to speak of (just a high pass on the tweeter) and it's a straight forward box. For the cabinet work I get by with a Makita SP6000 for cutting down the boar... | |
| Something For The Fuse Guys ... I was going to stay out of this but some of these posts are irresponsible...has anyone ever burned his house down because of a faulty fuse? Has any amplifier every blown up 💥 because of a faulty fuse? Has a house ever burned down 🔥 or amp blown up... |