June 8, 20179 yr Hi, My BHSE is in the hands of an engineer, an expert, of my total confidence. All fuses are OK, all tubes are OK, but the voltage of V + (B +) is half as it should be, there is a defect in the unit. We urgently need the BHSE scheme, but especially the PSU scheme. Justin, please....
June 8, 20179 yr Wow, you waited 27 whole minutes before complaining you hadn't heard back from Justin. Have you emailed him or called him at his business number to ask him about your problem? I'm not sure he hands out the schematic for his proprietary amp -- maybe he does or others have it -- but calm the fuck down and approach this like you would with any electronic product you have purchased.
June 8, 20179 yr Heeeeeeey, I did not complain. Justin is already aware of my problem and he even told me to look for an expert. I found him. Preliminary evaluations were performed and a problem was detected. But without the BHSE scheme it becomes very difficult to get a solution. And yes.... I'm in total panic. BHSE is not a blender.
June 9, 20179 yr The expert looking at the BHSE should be able to find the problem. Did he/she check unloaded vs loaded voltages, pre-reg and post-reg voltages, etc? If not, he/she is not an expert. From 2 seconds of googling images it looks like the BHSE power supply is the original version power supply with BJT current source, or similar.
June 9, 20179 yr Scheme: make plans, especially in a devious way or with intent to do something illegal or wrong. "he schemed to bring about the collapse of the government" synonyms: plot, hatch a plot, conspire, intrigue, connive, maneuver, plan "he schemed to bring about the collapse of the government" Schematic: (in technical contexts) a schematic diagram, in particular of an electric or electronic circuit.
June 9, 20179 yr What a rude people, my god! I'm just here asking for help. Is grammar really relevant?
June 9, 20179 yr Did you read the welcome PM you got when you joined here? If not, I would. This isn't your normal "headphone" site. Not sure why you didn't just go to head-fi and post this. Now
June 9, 20179 yr Ah! OK. Now I understand the nature of this forum. Sorry for anything. I just came here because I know Justin participates. Goodbye and happiness, very special people.
June 9, 20179 yr 3 hours ago, mypasswordis said: The expert looking at the BHSE should be able to find the problem. Did he/she check unloaded vs loaded voltages, pre-reg and post-reg voltages, etc? If not, he/she is not an expert. Was thinking the same thing.
June 9, 20179 yr 5 hours ago, Ekstatikon said: Ah! OK. Now I understand the nature of this forum. Sorry for anything. I just came here because I know Justin participates. Goodbye and happiness, very special people. Bye then
June 9, 20179 yr 8 hours ago, Ekstatikon said: Heeeeeeey, I did not complain. Justin is already aware of my problem and he even told me to look for an expert. I found him. Preliminary evaluations were performed and a problem was detected. But without the BHSE scheme it becomes very difficult to get a solution. And yes.... I'm in total panic. BHSE is not a blender. If Justin is already aware of your problem, how did he become aware of it...? Use the same method to contact him for a schematic.... zimple..!
June 9, 20179 yr The first BHSE's did use A1968's in the PSU but I hope Justin stopped that a while ago. Any PSU issue with this design, check the pass fets but any "engineer" should have figured that out on his own. Seriously, troubleshooting PSU is the really easy bit.
June 9, 20179 yr 12 hours ago, kevin gilmore said: sounds like a shorted zener also easy to fix this is probably correct. it's most likely the zener or the FET on the heatsink by the zener. Thats really about all the problem could be, from what I have seen, unless any burned resistors are spotted.
March 23, 20197 yr Hi all, Just joined the BHSE club acquiring a nice early specimen with the serial number #34 After some research here and on head-fi started to look for a set of good tubes. Here comes a question: There is a big variation in plate current in the EL34 kingdom from specimen to specimen. Since the output tubes are current sourced and sinked, is there a risk of burning the source/sink with a tube with a high plate current? For example Groove Tubes labels their EL34M according to their hardness parameter from 1 to 10 with the highest numbers being the most linear but as far as I understand drawing the most plate current. I'm looking for them (was advised the 7-9 range) but started wondering if too strong a tube can possibly burn its current source/sink? Thank you in advance for any input!
March 24, 20197 yr Because the Blue Hawaii current limits the tubes you don't have to worry and the Groove tube ratings won't change that. You do want to go for the high numbered tubes because they are late break up.
March 24, 20197 yr Thank you Kerry! A follow up question: Did anyone compare different hardness of Groove Tubes in BHSE? I found only few posts of people who tried them but no mention on the hardness. I can get number 7 quad, higher seems very rare. Thanks!
March 24, 20197 yr Hahaha It's their way of quantifying when the tube starts to distort. This is what Brent Jessee says: "The hardness is actually the plate current draw of the tube when under full operating voltages for the plate, screen grid, and with negative grid bias applied at the proper voltage" What plate current correspond to their "hardness" they however do not disclose as its their commercial secret. Only the higher the "hardness" the higher the plate current. The Shuguangs I inherited my BHSE with were rated 30mA but unfortunately gave up the ghost. PS Impressively made amp, Justin! Great job!
March 30, 20197 yr Hi guys, Sorry if this has been asked already: I rebiased a set of new tubes as per Justins instructions in a 4h session. Then after powering the amp again after few days the gain drifted away again to -27V and stays there unless I rebias again. Is that normal? I guess I dont need to rebias everytime I power it up? Another Q: Are the 2A and 0,2A fuses fast or slow blow? I wanted to try some nice silver ones. Thanks in advance!
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