|
|
|||||||
| Home | Forums | Rules | Articles | Store | Gallery | Blogs | Register | Donations | FAQ | Calendar | Search | Today's Posts | Mark Forums Read | Search |
| Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum |
| diyAudio Sponsor | ||
|
|
||
|
|
Thread Tools | Search this Thread |
|
|
#1 |
|
diyAudio Member
|
a friend of mine had put a fender bassman to repair on local guy. but he didnt check the amp properly. he retubed it and changed all the power supply caps fixed the bias section and bla bla bla but now it has LOTS of gain. it distorts BADLY i0m tring to get the gain better but that new ( sovtek ) tubes are hungry for gain.
i have about 140 / 150V feeding the preamp tubes and the cathode resistor is now 2K2 ohm. it has less gains but stil has to much. sould i uze a kind of voltage divider on each gain stage of this amp ? or what kan a go better ? are the preamp tubes 'cold' with 150V ? anr with 2k2ohm on the cathode ? The schematics are at http://www.schematicheaven.com/fende..._bassman50.pdf on the last gains stage before the phase spliter i get the cleanest sound that i ever heard. so the gain problem is before that. please help i home i'm clear enough. tankx in advance ^^
__________________
music music music music |
|
|
|
|
#2 |
|
diyAudio Member
Join Date: May 2008
|
obviously missing a resistor to ground or a wrong value's been fitted, could be a faulty capacitor or bad valve. you can't really go wrong these are such simple circuits.. you can e mail a close up of the amp i'll have a look, or send it to me with the valves and case removed and i'll fix it. (you pay carriage both ways though..)
|
|
|
| Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
| Thread Tools | Search this Thread |
|
|
|
|
||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| Prototype fender bassman for trade - echosonic or standel 25l15 | TelecasterTech | Tubes / Valves | 1 | 24th January 2012 05:53 PM |
| Fender Bassman Ten | Benny Bennett | Instruments and Amps | 2 | 2nd April 2009 01:01 PM |
| Fender Bassman- AB165 capacitor toss up | Willampsburn | Tubes / Valves | 1 | 9th February 2008 02:12 AM |
| Fender Bassman PT Rewind | OKBill | Tubes / Valves | 4 | 14th January 2007 02:51 PM |
| Modifing A Fender Bassman Scheme | amirmk | Tubes / Valves | 5 | 16th September 2005 07:34 PM |
| New To Site? | Need Help? |
| Page generated in 0.06806 seconds (65.90% PHP - 34.10% MySQL) with 10 queries |