starting a thread to document some info on this little amp. This is probably still in production as there are multiple listings on ebay. Typical price is $120 at this point. I recently bought a used (likely a customer returned semi-defective) unit, for a bit less, mainly to play with. Two 6J1...

I bought a pair of "as-is for repair/parts" he560 off ebay to play with. It is the "adorama exclusive" V4 version and seller was adorama so I suppose it was a customer-returned unit. Phones were in pretty good condition, probably used very little before being returned. The symptom was "audio...

5654 (6j1) pushing 6v6 (6p6p). Transformer coupled output, should be suitable for low Z planars. Probably not difficult to put into an enclosure, or just mount on a piece of wood and put a mesh basket over it. Has anybody played with one? For ~$100 worth a try?

Posting some LB P8 related info here. (tube headphone amp; my understanding is that this is the toroid transformer version of little bear P7) the build quality is not as solid as the darkvoice 336se. feels a lot more flimsy. the volume pot is small, probably of the carbon-film type. 100ka...

Disclaimer: HIGH VOLTAGE circuitry. Info presented is for entertainment purpose only. Do not try at home. Starting a thread to document my approach of 336SE mod. MassDrop is selling DarkVoice 336SE for $240. initial impressions: (with the stock tubes and a pair of Beyer DT990-600ohm.) --...

TL783 is used like a LM317, same pin out same basic circuit, except that it can handle up to 125v of Vin-Vout delta, making it semi-usable for a regulated high voltage supply, up to maybe 350v. It is a 3-pin device, input, output, adj. no gnd pin. output floats 1.25v above the adj pin voltage...

starting a thread to document some info and measurements. used 727A from yahoo.jp auctions, via Buyee. Transformer is 100v only. All external wiring are soldered to transformer posts, but only 100v winding magnet wires are available. (connecting to white, green, gray, brown). temp...

considering buying a pair of fancy bluetooth phones, full size, either over-ear or on-ear. What are the current best options? It is intended for home use so no need for active-noise-cancelling. Thanks for any info

noticed these on amazon, $8. Speaker protection board utilizing upc1237. value of the middle electrolytic capacitor affects the "on-delay" time. Relays engage when voltage at this cap reaches about 2v. 1000uf => ~50 seconds delay. This cap sees about 2.2v. Good addition to a tube amp...

Starting a thread to document mods being done to my Stax 007t amp. Hopefully someone else will find the info useful/entertaining as well. This amp is the older version with Champaign colored face plate (not the current silver face plate 007tA). Black PCB 08450-00131 PB-102. Tubes inside are...

KGSS has small signal diodes between stage 1 and 2. The standard part is 1n914, a silicon diode. 1n914: 100v peak reverse Vr=75v, If=300mA, Vf max=1v, Ir(@20v)=25nA According to Kevin Gilmore's KGSS article, the normal current through the diode is <2mA. HeadWize KGSS article I have tried...

I am looking for a chassis similar to the old "square" HeadAmp KGSS enclosure. Roughly 16.5" wide, 16" deep, height doesn't matter. Does anybody know where to find one?

starting a thread to document the Le Monstre build process.... Le Monstre = 8w class-A speak amp. Maybe good for driving large ortho-dynamic phones as well. I bought two Jim's audio le monstre kits quite a while back. These are red board kits, marking on the board is Y50087. The reason for...

starting a thread for E90 related info *** Post #5: front plate removal *** Post #30: parts-list for a basic upgrade. Disclaimer: info might not be complete/accurate; for casual reading / entertainment purpose only opening the case requires peeling off the thin aluminum face decal, the...

what is in this video, some kind of AKG?

Starting a thread to document some of the stuff I did on my Bose QuietComfort phones. If you have done mods/repairs to your QC's please contribute. my reasons of wanting to playing with Bose QC's: * Bose active-noise-canceling is very effective, especially in reducing the low frequency noise...

** Starting a new thread to document the modding of this little amp. Maybe somebody else can find the info useful somewhere down the road.   The goal of this mod is to (hopefully) improve the sound quality to the level of Creative Sound Blaster E3. Some sound impression/ comparison of PHA50 vs...

** quick impression on the SQ (bluetooth connection): - sound is a bit bright, presentation is rather layback, sound stage not very open. Output power is pretty ok, some distortion at max volume when running hard-to-drive ortho phones (32 ohm SFI drivers), but definitely have enough juice for...

Starting a thread to document  some info/mod on the SkullCandy Hesh-2 Bluetooth phones. Lets see if the sound quality can be improved.   My reasons for choosing the Hesh-2...it is the over-the-ear type, with pleather pads, should provide good noise isolation, and more importantly, to me at...

Looks like this model is discontinued, does anybody know where to find iGrados these days?

** sound quality from the stock phone is not a concern, as it can be improved relatively easily **   I am in the market for a pair of full size bluetooth phones. My main requirement is the comfort factor, it needs to be comfortable enough to wear for long periods, and of course the build...

I have a minimax that used Nichicon Muse bi-polar as output caps. I want to open up the sound a little more by changing the caps to Mundorf 680uf E-caps but there isn't much room in the case for that. The solution.....add external cap holders and mount the Mundorfs outside. Held down using some...

I am in the market for some inexpensive IEM or earbuds to keep around at work. -- Budge is $20. -- Either with or without a mic is ok. -- I don't plan to wear them a lot so the build quality is not terribly important (as long as the sound is good)   I did a on-line search and it brought up...

I got to try on the Shure 1540 at the Denver meet two days ago, and felt it was super comfy, the comfy-ness is up there with the HD800's. Thought it would be nice to have something like that on my Fostex T50rp (which currently has 840 pads).   If 1540 pads can fit the 840 there is a good...

MoonAudio is selling a King Sound portable amp with stax type socket, has anybody tried it?   Pretty expensive and not very small (could not find the size spec but judging from the picture probably 3"x5.25" x1"?) .