i am trying to make a cmoy like thingie using ne5532 (thats all i have at hand in duals at present, might replace later). power right now is from 7815/7915. I am using r2=27k, r3=33k, r4=150k. Load is a 330R resistor. Ckt is here. Cap is presently 0.1uf for testing, will increase it later. ckt...

I checked the output resistance of the 7812, its listed at around 15 milliohms while the tenergy 9v rechargeable is listed at max 1200 milliohms.   http://www.synthdiy.com/files/2006/LM7812.pdf   http://www.all-battery.com/datasheet/10001_datasheet.pdf   It doesn't look like the resistor...

  I was asking about the battery as a load while charging it, not as a source. Just to test the circuit in ltspice.   I guess i gotta live with option 1. I think 2 would require me to disconnect the batteries when they are charged or it might damage the batteries or would need some detection...

I am trying to use the charger from o2. I am  using a single battery and will be using dc input, say a 15v walwart, this is to drive a cmoy based on ne5532.  Attached is the circuit I am trying to simulate. I had a few questions about this.   1. How do I simulate a battery. What would be the...

There are no mounting holes. How have you guys mounted it on the chassis. The only thing i see is the pot that can be mounted, but is that mounting strong enough to hold the pcb and the tubes. I was actually thinking of ditching the pot, but looks like i might need it... Any issues with a 100k...

I am eagerly waiting for the pcb for the 12au7 version.I have the cisco 0.38a supply, headphones are realistic pro30 (32 ohms) and koss porta pro (60 ohms). Chain would be PC->ODAC->B1 preamp->SSMH. I have a few doubts that wanted to clarify while I wait for the pcb to arrive. 1. Is there an...

Ok, I made a mistake, I see that both triodes are being used for a single channel and both the triodes in a tube are shorted to each other.. I dont understand why its done like this though.

i expect to see one tube, but in the first post of this thread, the pcb images and completed build pics have two tubes.

In the schematics, I see a single triode being used for each of the channels, but in the build pics and pcbs, I see two twin triodes 12au7 being used. what am i missing here.

I already have an O2, makes sense to still get this? Does this have tube like sound or more SS like sound?

there's a gb going on for subbu dac v3 on diyaudio.

sorry, didnt notice there's a mega thread for recommendations. added the content there. mods, please delete this thread.

Oops! didnt notice this thread and started another one, newbie mistake. Will post the needs here and ask the mods to delete the other thread.   A friend of mine is looking for headphones in about 200$ budget. He's currently considering senn 558s. Mainly listens to jam bands (dead etc), some...

A friend of mine is looking for headphones in about 200$ budget. He's currently considering senn 558s. Mainly listens to jam bands (dead etc), some jazz and some classic rock, most of the times live shows though, no mp3s, almost always flacs. headphones need to be forgiving enough to play...

I've been pondering over this. I am a newbie going for low voltage tube hp amps for the time being. what are the advantages of going for high voltage tubes over low voltage ones.

Quote:   Got hold of RCA 12AU7A on ebay. From the pics, looks like cleartop with black plates. logo says hammond and the number mentioned is 274-6026. Any idea how good or bad are these. Should work with this amp right.

Quote: Thank you, that surely helps.

Quote: Actually I am not sure which tube i should go for, as long as its low voltage. I will go with whatever recommendations I get here as I am a total tube newbie. Yes, google is a friend as long as you know what you are looking for.

i am a tube newbie, want to build this as a first tube project. whats a good source for these tubes. which tubes are good, I see russian, chinese etc on ebay. any recommendations? dont want to spend too much though. any particular brand i should be looking at.

get some card for gaming and get a ODAC usb dac for music.

Quote: asus advertises the opamp rolling as a feature. you dont need to do any soldering, just pull out the opamp from the socket and put the new one in. I dont think this should void the warranty, but just check in any case.

Quote: Thank you, these are helpful. I have made some interconnects in the past based on belden rg6 cables. Never tried changing for the headphones cables. I know soldering also, though not an expert.

Quote:   Here's the thread on hifivision by gurubhai on orthos.

I am from india and mainly into home audio and diy. Just getting started with headphones. Hope to learn and contribute here in the long run. Music tastes include classic rock, blues, jazz, western classical, indian classical.   Headphone Gear: So far I have the koss porta pro headphones...

the cables are quite thin with these. any recommended cables for these, what gauge is good enough? Any tweaks to improve the midrange.